TypeScript adds static typing to JavaScript, catching errors at compile time. Start with strict mode enabled for maximum type safety. Use interfaces over type aliases for object shapes that can be extended. Prefer type aliases for unions, intersections, and primitive types. Use generics for reusable, type-safe components. Avoid any type; use unknown when type is truly unknown. Use discriminated unions for handling different states. Implement type guards for runtime type . Use readonly modifiers for immutable data. Leverage TypeScript's utility types: Partial, Required, Pick, Omit. Use const assertions for literal types. Implement proper null checking with strict null checks. Use optional chaining (?.) and nullish coalescing (??). Define clear module boundaries with barrel exports. Use path aliases for cleaner imports. Implement consistent naming conventions: interfaces with PascalCase, types with PascalCase. Use enums sparingly, preferring union types. Write tests for your type definitions. Use ESLint with TypeScript rules for code quality. Leverage declaration maps for better debugging. TypeScript improves developer experience, reduces bugs, and documents code effectively.