# Patterns
All Patterns notes →01 — Message Broker Patterns
Queue, Topic, Fan-out, Dead Letter Queue, and Delayed Queue — the delivery topologies a message broker offers and when each one fits.
patterns messaging-patterns book maang-prep
02 — Event Patterns
Event Notification vs. Event-Carried State Transfer, and Choreography vs. Orchestration — how services stay decoupled through events, building on the Event Sourcing and Saga patterns already covered in this book.
patterns messaging-patterns book maang-prep
03 — Streaming Patterns
Windowing, Watermarks, and Exactly-Once vs. At-Least-Once vs. At-Most-Once delivery semantics — the vocabulary for reasoning about correctness in a stream processing pipeline.
patterns messaging-patterns book maang-prep