TL;DR: React best practices transform your frontend from fragile UI code into stable architecture. Component composition, controlled state management, and measurement-driven performance optimization are the foundation. Build systems that scale, not just features that work. React development is not about making buttons click and forms submit. It's about engineering systems that remain predictable when your user base grows 10x, when your team doubles, and when feature requests never stop coming. Most teams treat React like a simple UI library. They throw components together, manage state however feels convenient, and optimize performance only when things break. This approach works for demos. It fails for real products. React Is Architecture, Not Just UI Code When you build React applications properly, you're designing software architecture. You control component boundaries. You define state flow. You manage rendering intentionally.…