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AWS Solutions Architect exam prep

TechTalk With Balu

AWS Solutions Architect Exam Prep is your deep-dive companion for mastering AWS architecture and passing the SAA certification with confidence.

Hosted by Balu, a Solutions Architect, this podcast goes beyond memorizing services. We break down core AWS concepts, real-world architecture patterns, cost optimization strategies, high availability design, security best practices, and exam-focused scenarios.

If you want to think like an architect - not just pass the exam - this is for you.

Perfect for:

AWS SAA-C03 candidates & Engineers transitioning into cloud

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  • 26 episodes
  • weekly
  • Avg 33 min
  • English

Episodes 26

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  • S1 · E17
    June 8 · 49 min

    Episode 15: Monitoring & Observability - CloudWatch, CloudTrail & AWS Config | Interactive Format | SAA-C03

    Master CloudWatch, CloudTrail & AWS Config! NEW interactive format with Pulse Checks, Trap Spotlights & Memory Hooks for active recall. 🆕 NEW INTERACTIVE FORMAT 🎯 PULSE CHECKS - Quick questions with real pauses (test yourself!) ⚠️ TRAP SPOTLIGHTS - Exam traps highlighted when topic is fresh 💡 MEMORY HOOKS - Vivid analogies that stick Active recall = 2-3x better retention than passive listening! 📈 CLOUDWATCH METRICS Every AWS service publishes metrics automatically. Metrics belong to namespaces, with dimensions identifying specific resources. CRITICAL: AWS doesn't track RAM by default! CPU/network/disk = yes. Memory/disk-inside-filesystem = NO. For RAM, install the CloudWatch Unified Agent. Memory hook: AWS sees your VM from OUTSIDE, not inside. Metric Streams push metrics to Datadog, Splunk, S3 via Kinesis Firehose. 📜 CLOUDWATCH LOGS Structure: Log Groups → Log Streams. Retention 1 day to 10 years (or forever). Encrypted by default; KMS optional. SOURCES: • EC2/on-prem: CloudWatch Logs Agent or Unified Agent • Lambda, ECS, API Gateway, Route 53, VPC Flow Logs: Native • CloudTrail: Filter-based THREE WAYS TO USE LOGS: • INSIGHTS: Query historical logs (librarian) • SUBSCRIPTIONS: Real-time stream to Kinesis/Lambda (journalist) • S3 EXPORT: Bulk archival, up to 12-hour delay (moving truck) TRAP: S3 Export is NOT real-time! For real-time, use Subscriptions. 🚨 CLOUDWATCH ALARMS States: OK, ALARM, INSUFFICIENT_DATA. Actions: EC2 (stop/terminate/reboot/RECOVER), Auto Scaling, SNS notifications. EC2 Recovery: System status check fails → instance moved to new hardware. Memory hook: System = AWS's problem, Instance = Your problem. COMPOSITE ALARMS: Combine alarms with AND/OR to reduce alarm noise. METRIC FILTERS: Convert log patterns into alarms. 🔍 AWS CLOUDTRAIL Enabled by DEFAULT! Records WHO did WHAT, WHEN, FROM WHERE. EVENT TYPES: • Management events (default ON): Resource operations • Data events (default OFF): S3 object access, Lambda invocations • Insights events: Anomaly detection 90-DAY RETENTION in CloudTrail. For longer, log to S3 + query with Athena. If a resource is unexpectedly deleted → check CloudTrail FIRST! Pattern: CloudTrail + EventBridge = Real-time security alerts. 📋 AWS CONFIG Tracks resource configurations over TIME. Per-region, can aggregate cross-region/account. CONFIG RULES: 75+ managed rules + custom Lambda rules. Evaluate on change or schedule. TRAP: Config DETECTS, doesn't PREVENT! For prevention use IAM/SCPs. Memory hook: Config = camera, not door lock. Auto-remediation via SSM Automation Documents. 🎯 CLOUDWATCH vs CLOUDTRAIL vs CONFIG (most-tested!) CLOUDWATCH = Performance ("How fast? Is it healthy?") CLOUDTRAIL = Audit ("Who? When? From where?") CONFIG = Compliance ("What does it look like? Compliant?") Same ALB, three stories: • CloudWatch: Connection metrics, error % over time • CloudTrail: Who modified the listener config? • Config: Is the SSL cert always assigned? ⚠️ TOP EXAM TRAPS 1. Three-service distinction (Performance/Audit/Compliance) 2. RAM needs Unified Agent (not default) 3. CloudTrail enabled by default 4. CloudTrail 90-day retention (use S3 for longer) 5. Data events NOT logged by default (S3, Lambda) 6. Config DETECTS, doesn't PREVENT 7. S3 Export NOT real-time (12-hr delay) 8. System vs Instance status check (recovery vs no help) 9. Composite alarms reduce noise (AND/OR) 10. EventBridge = CloudWatch Events 11. Insights = query engine, Subscriptions = real-time Perfect for SAA-C03 prep and real-world AWS operations! #AWS #CloudWatch #CloudTrail #AWSConfig #Monitoring #SAAC03 #SolutionsArchitect ⭐ 5-star rating if this helps!

  • S1 · E16
    June 1 · 39 min

    Episode 14: Content Delivery & Global Apps - CloudFront, Caching Strategies & Latency Optimization | SAA-C03

    Master CloudFront! CDN fundamentals, caching strategies, and CloudFront vs Global Accelerator in under 40 minutes. 🚀 WHY CDNs MATTER A user in Tokyo hitting a server in Virginia waits 300-400ms per round trip. A CDN caches content at hundreds of edge locations close to users, dropping latency to milliseconds. CloudFront also provides DDoS protection (Shield + WAF) and reduces origin load. 🌐 CLOUDFRONT ORIGINS • S3 BUCKET: Secure with Origin Access Control (OAC). Bucket stays private, only your distribution can read it. • VPC ORIGIN: Deliver from private subnets (ALB/NLB/EC2) without internet exposure • CUSTOM ORIGIN: Any public HTTP backend. Restrict with security groups using CloudFront IPs. 📦 HOW CACHING WORKS • CACHE HIT: Served from edge in milliseconds • CACHE MISS: CloudFront fetches from origin, caches locally • TTL controls cache duration • Cache behaviors apply different rules to different URL paths • Cache keys identify objects (URL + optional headers/cookies/query strings) 🎯 CACHING STRATEGIES • Static (images, CSS, JS): Cache aggressively (1 day+) • Dynamic (news, listings): Short TTLs (60s-5min) still give massive gains • Personalized: TTL=0 but still benefits from AWS backbone + DDoS protection 🔄 CACHE INVALIDATION Force refresh before TTL. Use wildcards or paths. First 1,000 paths/month free. Better: version filenames (style-v2.css). 🔒 SECURITY • GEO RESTRICTION: Allowlist/blocklist by country • SIGNED URLs: Time-limited access to ONE file • SIGNED COOKIES: Authorize access to MANY files • WAF integration: Block attacks at the edge 🆚 CLOUDFRONT vs S3 CROSS-REGION REPLICATION CloudFront: Cached static content globally, TTL-based CRR: Actual replicas in specific regions, near real-time, dynamic content 🆚 CLOUDFRONT vs GLOBAL ACCELERATOR (heavily tested!) CLOUDFRONT: • HTTP/HTTPS only, caches at edge • IPs change (DNS-based) • Best: static + dynamic web content GLOBAL ACCELERATOR: • Any TCP/UDP, no caching - proxies to origin • 2 STATIC anycast IPs (never change!) • Fast regional failover under 1 minute • Best: gaming (UDP), IoT (MQTT), VoIP, firewall whitelisting, multi-region failover KEYWORD TRIGGERS: "Gaming" "UDP" "static IP" "regional failover" → Global Accelerator "HTTPS" "caching" "static content" "global users" → CloudFront ⚡ EDGE COMPUTING CLOUDFRONT FUNCTIONS: JavaScript, sub-ms startup, millions/sec. Limited: <1ms execution, 2MB memory, no network. Use for cache key normalization, headers, URL rewrites, simple auth. LAMBDA@EDGE: Node.js/Python, 5-10s execution, up to 10GB memory, network + file system access. Use for image resizing, AWS SDK calls, complex auth. 6x more expensive than CloudFront Functions. ⚠️ TOP EXAM TRAPS • Use Origin Access Control (NOT public S3) for security • CloudFront = HTTP/S only; Global Accelerator = static IPs • Signed URLs = one file; Signed cookies = many files • Frequent invalidations expensive → version filenames • VPC Origins for private backends • Geo Restriction is built-in (no custom code) • CloudFront Functions vs Lambda@Edge: scale vs power 🏗️ REAL ARCHITECTURES 1. Static site: CloudFront + S3 with OAC = serverless global website 2. Add API: CloudFront routes /api/* to API Gateway + Lambda + DynamoDB 3. Global app: + DynamoDB Global Tables for multi-region 4. Photo app: CloudFront for uploads (Transfer Acceleration) and downloads ⏱️ TIMESTAMPS 00:00 Intro | 01:30 Why CDNs | 04:00 Origins | 08:00 Caching | 13:00 Invalidation | 15:00 Security | 17:30 vs CRR | 20:00 vs Global Accelerator | 24:00 Edge Computing | 28:00 Architectures | 32:00 Exam Traps | 39:00 Conclusion Perfect for SAA-C03 prep and building globally distributed apps! #AWS #CloudFront #CDN #GlobalAccelerator #SolutionsArchitect #SAAC03 #CloudComputing ⭐ 5-star rating if this helps!

  • S1 · E15
    May 26 · 40 min

    Episode 13: Messaging & Event Architecture - SQS, SNS & EventBridge Explained | SAA-C03

    Master decoupling! SQS, SNS, and EventBridge with the fan-out pattern and exam traps. 🔑 WHY DECOUPLING MATTERS When apps talk directly and traffic spikes (10 videos suddenly becomes 1,000), tightly-coupled systems crash. Put a messaging layer between them and each part scales independently. SQS = queue. SNS = pub/sub. Kinesis = streaming. 📬 AMAZON SQS (QUEUE) Producers send messages, consumers poll and process them. STANDARD QUEUE: • Unlimited throughput and messages • Retention: 4 days default, 14 days max • Message size: up to 256 KB • At-least-once delivery (possible duplicates!) • Best-effort ordering (possible out-of-order!) VISIBILITY TIMEOUT: After a consumer polls a message it becomes invisible (default 30 sec). If not deleted in time, it reappears. Too short = duplicates. Too long = slow retries after a crash. Use ChangeMessageVisibility for more time. LONG POLLING: Consumer waits up to 20 sec for messages. Reduces API calls and latency. Preferred over short polling. FIFO QUEUE: First-In-First-Out ordering + exactly-once (deduplication). Throughput limited to 300 msg/s (3,000 with batching). KEY PATTERNS: • SQS as buffer before a database = no lost transactions during spikes • SQS + Auto Scaling = scale consumers using ApproximateNumberOfMessages metric 📢 AMAZON SNS (PUB/SUB) Send one message to many receivers. Producer publishes to one topic, all subscribers get a copy. • Up to 12,500,000 subscriptions per topic; 100,000 topics per account • Subscribers: SQS, Lambda, Kinesis Data Firehose, HTTP/S, email, SMS • Integrates with CloudWatch Alarms, S3 events, ASG, RDS events • SNS FIFO available (ordering + deduplication) 🔀 THE FAN-OUT PATTERN (HEAVILY TESTED!) Push once to an SNS topic, receive in all subscribed SQS queues. Fully decoupled, no data loss, add subscribers anytime. CRITICAL: SQS queue access policy must allow SNS to write! Works cross-region. Classic use case: S3 allows only ONE event notification per event-type + prefix combo. To send one S3 event to multiple queues, fan-out through SNS. 🎯 SNS MESSAGE FILTERING JSON filter policies on subscriptions route messages (placed vs cancelled vs declined orders). No filter = subscriber gets everything. ⚡ AMAZON EVENTBRIDGE (formerly CloudWatch Events) Two jobs: SCHEDULE cron jobs, and REACT to events with patterns. • Sources: EC2 state changes, CodeBuild, S3, CloudTrail API calls, schedules • Destinations: Lambda, SQS, SNS, Step Functions, ECS, Kinesis, and more • Event buses: Default (AWS), Partner (SaaS), Custom (your apps) • Resource-based policies aggregate events across AWS accounts • Archive & Replay events; Schema Registry infers/versions structure 🧭 CHOOSING THE RIGHT SERVICE SQS: queue, one message → one consumer, decouple/buffer SNS: pub/sub, one message → many subscribers, notifications/fan-out EventBridge: react to AWS events, schedule, SaaS integration, rich filtering ⚠️ TOP EXAM TRAPS • Standard SQS = duplicates + out-of-order (need ordered? FIFO) • Same message twice? Visibility timeout too short • SQS retention max 14 days (longer? archive to S3) • Fan-out failing? SQS access policy must allow SNS • S3 = one notification per event-type+prefix (use fan-out) • SNS alone doesn't persist (add SQS subscriber for retries) • CloudWatch Events = EventBridge (same service) • React to AWS events or schedule? EventBridge, not SNS • Message over 256 KB? Store in S3, send reference ⏱️ TIMESTAMPS 00:00 Intro | 01:30 Why Decoupling | 04:00 SQS Basics | 08:00 SQS Advanced | 14:30 SNS | 19:00 Fan-Out | 23:00 SNS Filtering | 25:00 EventBridge | 31:00 Choosing | 34:00 Exam Traps | 39:00 Conclusion Perfect for SAA-C03 prep and building decoupled, event-driven architectures! #AWS #SQS #SNS #EventBridge #Serverless #SolutionsArchitect #SAAC03 #CloudComputing ⭐ 5-star rating if this helps!

  • S1 · E14
    May 20 · 40 min

    Episode 12: AWS Lambda & Serverless Architecture - Functions, API Gateway & Step Functions | SAA-C03

    Complete serverless guide! Lambda, API Gateway, Step Functions, Cognito and 5 real architectures in 40 minutes. 🚀 SERVERLESS PARADIGM No servers to manage. You write code, AWS handles infrastructure. Automatic scaling, pay only for actual use. ⚡ LAMBDA FUNDAMENTALS CRITICAL LIMITS (exam tested): • Max execution: 15 MINUTES (900 seconds) - hard limit! • Memory: 128 MB - 10 GB (CPU scales with RAM) • Concurrency: 1,000 simultaneous executions default • Deployment: 50 MB compressed, 250 MB uncompressed • /tmp storage: Ephemeral, doesn't persist! PRICING: FREE tier 1M requests/month + 400K GB-seconds. Beyond: $0.20 per 1M requests. Example: 3M requests = $4.73/month vs $30-50 on EC2 (85% savings!) COLD vs WARM STARTS: First invocation slower (100ms-few seconds), subsequent fast (<10ms). Provisioned Concurrency eliminates cold starts. 🔗 LAMBDA INTEGRATIONS Triggers: API Gateway (REST APIs), S3 (file events), DynamoDB Streams (data changes), Kinesis (streaming), SNS/SQS (messaging), EventBridge (CRON jobs), ALB (HTTP), Cognito (auth). Execution modes: Synchronous (caller waits), Asynchronous (fire-and-forget), Event source mapping (Lambda polls). 🌐 API GATEWAY Create REST APIs backed by Lambda. Features: API versioning, multiple environments, authentication (IAM/Cognito/custom), throttling, caching, transformations. Integrations: Lambda (most common), HTTP proxy (add auth/throttling), AWS services (direct Kinesis/SQS). Endpoints: Edge-Optimized (CloudFront global), Regional (same region), Private (VPC only). CRITICAL: 29-second timeout! Lambda runs 15 min but API Gateway times out at 29 sec. 🔄 STEP FUNCTIONS Orchestrate multiple Lambdas into workflows. Visual state machines with sequence, parallel, choice, wait states, error handling with automatic retries. Standard workflows (up to 1 year, exactly-once). Express workflows (5 min, at-least-once, cheaper). Use cases: Order fulfillment, ETL pipelines, human approval, multi-step business logic. 👤 COGNITO User Pools: Serverless user database. Sign-up/in, password reset, MFA, social login (Facebook/Google/SAML). Integrates with API Gateway/ALB for JWT validation. Identity Pools: Temporary AWS credentials for direct S3/DynamoDB access from mobile/web apps. EXAM KEY: Cognito for mobile/web users. IAM for services. Keywords "mobile users" "Facebook login" = Cognito! 🏗️ 5 REAL ARCHITECTURES 1. REST API: API Gateway + Lambda + DynamoDB + Cognito 2. Thumbnail Service: S3 → Lambda → S3 + DynamoDB (thousands/sec) 3. CRON Jobs: EventBridge → Lambda → SNS ($0.50/month vs $30 EC2) 4. Data Pipeline: Kinesis → Lambda → Firehose → S3 (millions/day) 5. Mobile Backend: Cognito + API Gateway + Lambda + S3 + DynamoDB ⚠️ 12 CRITICAL EXAM TRAPS 1. Lambda max 15 MIN (longer = EC2/Batch/ECS) 2. Cold starts exist (Provisioned Concurrency eliminates) 3. Concurrency 1,000 default (request increases) 4. Lambda in VPC slower cold starts 5. API Gateway 29-SEC timeout (async for longer) 6. /tmp EPHEMERAL (S3/EFS for persistence) 7. Deployment 250 MB limit (use Layers) 8. DynamoDB Streams prerequisite for Global Tables 9. Cognito for users, IAM for services 10. Step Functions for orchestration (not manual chaining) 11. ALB can invoke Lambda (target group) 12. Environment variables 4 KB (Parameter Store for more) ⏱️ TIMESTAMPS 00:00 Introduction | 01:00 Serverless Paradigm | 03:00 Lambda Fundamentals | 08:00 Lambda Triggers | 12:00 API Gateway | 16:00 Step Functions | 19:00 Cognito | 22:00 5 Architectures | 29:00 12 Exam Traps | 36:00 Tips | 38:30 Conclusion Perfect for SAA-C03 exam and understanding event-driven serverless! #AWS #Lambda #Serverless #APIGateway #StepFunctions #Cognito #SAAC03 ⭐ 5-star rating if this helps! 🔗 docs.aws.amazon.com/lambda

  • S1 · E13
    May 17 · 38 min

    Episode 11: VPC Architecture Deep Dive - Subnets, NAT Gateway & Security Groups vs NACLs | SAA-C03

    Complete VPC guide! Subnets, routing, NAT Gateway & Security Groups vs NACLs explained in under 40 mins. 🏗️ VPC FUNDAMENTALSCIDR: 10.0.0.0/16 = 65,536 IPs. Cannot change after creation!AWS RESERVES 5 IPs: .0 (network), .1 (router), .2 (DNS), .3 (reserved), .255 (broadcast)Example: /24 = 256 addresses, only 251 usable 📊 SUBNETSONE SUBNET = ONE AZ!PUBLIC: Route to IGW (web servers, load balancers)PRIVATE: No IGW route (databases, app servers) 🌍 INTERNET GATEWAYBidirectional access. One per VPC. FREE. Need: route + public IP + SG + NACL. 🔄 NAT GATEWAYOutbound-only for private instances. In PUBLIC subnet. One per AZ. Cost: $0.045/hr + $0.045/GB. 🛣️ ROUTE TABLESPUBLIC: 0.0.0.0/0 → IGWPRIVATE: 0.0.0.0/0 → NAT 🔒 SECURITY GROUPS vs NACLs (CRITICAL!)SECURITY GROUPS: STATEFUL, instance-level, ALLOW onlyNACLs: STATELESS, subnet-level, ALLOW/DENY Stateful = return traffic auto-allowedStateless = must allow both directions! 🔗 VPC PEERINGConnect VPCs. NOT TRANSITIVE! A↔B↔C ≠ A↔C 🔌 ENDPOINTSGateway (S3/DynamoDB): FREEInterface (other services): Paid ⚠️ 12 TRAPS SG stateful vs NACL stateless Peering not transitive Subnets = one AZ NAT in public subnet 5 IPs reservedAnd 7 more! ⏱️ TIMESTAMPS00:00 Introduction | 01:00 VPC Fundamentals | 04:00 Subnets | 08:00 IGW | 10:00 NAT | 13:00 Routes | 16:00 SG vs NACL | 22:00 Peering | 25:00 Endpoints | 31:00 Traps #AWS #VPC #SecurityGroups #NACL #SAAC03 #Networking Tags: AWS, VPC, Networking, Security Groups, NACL, NAT Gateway, Subnets, Solutions Architect, SAA-C03, Cloud Networking, Route Tables, VPC Peering, Stateful, Stateless, AWS Exam, Tech Podcast

  • S1 · E12
    May 10 · 21 min

    Episode 10.5: Exam Q&A - 35 Rapid-Fire Questions: ASG, S3, Storage, Databases & Route 53 | SAA-C03

    Test your knowledge! 35 rapid-fire questions covering Episodes 6-10: Auto Scaling Groups, S3, Storage Architectures, Databases & Route 53. ⚡ HOW THIS WORKS ACTIVE RECALL FORMAT: - I ask a question - 5-second pause for you to think - I give the answer + explanation - Track your score (1 point per correct answer) This is ACTIVE RECALL - the most effective study method. Testing yourself is 2-3x more effective than passive review! 📋 QUESTION BREAKDOWN AUTO SCALING GROUPS (7 Questions): - ASG capacity constraints (min/desired/max) - Scaling policies (Target Tracking vs Scheduled) - EC2 vs ELB health checks - Lifecycle hooks - Termination policies - Predictable vs unpredictable scaling Sample: "ASG has min 2, desired 6, max 10. You terminate 3 instances. What happens?" AMAZON S3 (7 Questions): - Storage classes & costs (Glacier Deep Archive $1/TB!) - Minimum storage durations (Standard-IA 30 days) - Versioning (only new objects after enabling) - Cross-Region Replication (existing objects don't replicate) - Bucket name uniqueness - Lifecycle transitions (one-way only!) - Multi-part upload requirements Sample: "Delete Standard-IA object after 15 days. What charges?" STORAGE ARCHITECTURES (7 Questions): - EBS AZ-locked (snapshot to move) - EFS vs EBS (multiple instances = EFS) - Boot volume restrictions (HDD cannot boot) - EFS Linux-only trap (Windows = FSx) - S3 not mountable as file system - EBS Multi-Attach limits (16 instances, same AZ, io2 only) - Cost optimization (One Zone-IA 90% savings) Sample: "10 servers sharing files. EBS or EFS?" AWS DATABASES (9 Questions): - Multi-AZ vs Read Replicas (THE critical distinction!) - Async replication = eventual consistency - Aurora vs RDS failover times (30s vs 60-120s) - Aurora storage auto-scaling (never runs out) - Encryption trap (can't enable on existing) - Redis vs Memcached (HA needs Redis) - ElastiCache load reduction (80%+) - Stopped RDS charges (storage continues) - Aurora Global replication lag (<1 second) Sample: "High read load. Enable Multi-AZ?" (NO - use Read Replicas!) AMAZON ROUTE 53 (5 Questions): - CNAME vs Alias for zone apex (THE trap!) - Latency routing for performance - Failover routing health checks (mandatory!) - Geolocation default record requirement - Health checks for private resources (CloudWatch alarms) Sample: "Point example.com to load balancer. CNAME or Alias?" 🎯 SCORING GUIDE 30-35 correct: EXAM READY! ⭐⭐⭐⭐⭐ Strong mastery. Keep doing practice questions. 25-29 correct: VERY GOOD! ⭐⭐⭐⭐ On the right track. Review missed questions. 20-24 correct: GOOD FOUNDATION ⭐⭐⭐ Solid base but needs more study. Focus on weak areas. 15-19 correct: GAPS TO FILL ⭐⭐ Watch episodes again, take notes, re-quiz. Below 15: NEEDS REVIEW ⭐ Don't worry! Material is complex. Rewatch Episodes 5.5-9. 💡 WHY ACTIVE RECALL WORKS Research shows: - Testing yourself = 2-3x better retention than re-reading - Active recall strengthens memory connections - Immediate feedback corrects misconceptions - Spaced repetition with re-testing = long-term memory HOW TO USE THIS EPISODE: 1. First attempt: Track your score 2. Review episodes for missed questions 3. Re-take quiz after 3 days 4. Re-take again before exam 5. Aim for 30+ correct on every attempt 📚 EPISODES COVERED: Episode 6: Auto Scaling Groups Episode 7: Amazon S3 Deep Dive Episode 8: Storage Architectures (EBS vs EFS vs S3) Episode 9: AWS Databases (RDS, Aurora, ElastiCache) Episode 10: Amazon Route 53 (DNS & Traffic Routing) Pro tip: Retake this quiz multiple times until you score 30+ consistently. That's exam-ready mastery! #AWS #ExamPrep #SAAC03 #SolutionsArchitect #QuizTime #ActiveRecall #StudyTips #AutoScaling #S3 #Storage #Databases #Route53 #InteractiveLearning ⭐ Leave a 5-star rating if this quiz helps you identify gaps! 📱 Share your score in the comments - what did you get out of 35?

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