Pick a scenario to see architecture diagrams + side-by-side analysis. Know exactly what to say in interviews.
SQL (PostgreSQL) vs NoSQL (Cassandra/DynamoDB)
SQL (PostgreSQL/MySQL) vs NoSQL (DynamoDB/MongoDB)
Redis vs Memcached
Kafka vs RabbitMQ vs SQS
REST vs gRPC vs GraphQL
Monolith vs Microservices
Push (Fan-out on Write) vs Pull (Fan-out on Read)
WebSocket vs SSE (Server-Sent Events) vs Long Polling
Strong Consistency vs Eventual Consistency
Vertical (Scale Up) vs Horizontal (Scale Out)
Cassandra vs DynamoDB vs MongoDB
Cache-Aside (Lazy Loading) vs Write-Through vs Write-Back (Write-Behind)
Sharding (Horizontal Partitioning) vs Read Replicas
Synchronous vs Asynchronous
PostgreSQL vs MySQL (InnoDB)
AWS ELB (ALB/NLB) vs Nginx vs HAProxy
Containers (Docker) vs Virtual Machines
Fan-out on Write (Push) vs Fan-out on Read (Pull)