DRY (Don't Repeat Yourself)
Every piece of knowledge must have a single, unambiguous, authoritative representation within a system. Eliminates duplication to reduce maintenance costs.
DRY: Every Piece of Knowledge, Once
The difference between duplicating code and duplicating knowledge — and why the second one hurts.
DRY in Production: Single Sources of Truth
Config, schemas, and documentation as single sources of truth across services.
Advanced DRY: Abstraction Boundaries
The failure modes of over-abstraction and how to keep shared code honest.
DRY: Review & Mastery Quiz
Scenario questions on knowledge duplication and abstraction boundaries.
Free Books & Guides
Official Documentation
Video Courses
DRY (Don't Repeat Yourself) — Explained (YouTube)
A video explanation of the DRY (Don't Repeat Yourself) principle with practical examples.
freeCodeCamp — Software Architecture Course
A comprehensive course covering software architecture principles, patterns, and best practices.
ByteByteGo — Distributed Systems
High-quality animated explanations of system design principles, distributed systems, and architecture patterns.