Node.js official docs — the primary reference for every built-in module. The API docs are thorough; the guides section explains higher-level concepts like streams and event loop.

Node.js changelog — track what each version adds and deprecates; essential for knowing what's safe to use in your target Node version.

V8 blog — the V8 team publishes detailed posts about GC improvements, JIT optimizations, and new JavaScript features; indispensable for understanding engine behaviour.

libuv documentation — the event loop and thread pool live here; useful when debugging low-level async behaviour.

WHATWG Streams Specification — the spec that Node's Web Streams API implements; explains the backpressure model in detail.

Node.js Best Practices (GitHub) — a community-maintained list of 80+ categorized best practices; covers security, error handling, testing, and deployment.

You Don't Know JS (GitHub) — free book series; scopes/closures, async/await, and the JavaScript engine are covered at a depth you won't find in tutorials.

The Node.js Event Loop, Timers, and process.nextTick (nodejs.org) — the definitive official explanation of event loop phases.

12factor.net — the original Twelve-Factor App manifesto; the principles behind stateless services, config as environment, and log streams.

OWASP Node.js Security Cheat Sheet — comprehensive security checklist specific to Node.

npmjs.com — the npm registry; search for packages, read download stats, check last-publish dates, and review README quality before adopting a dependency.

Socket.io documentation — the standard real-time library; covers rooms, namespaces, and reconnection logic.

Prisma documentation — the most ergonomic ORM for TypeScript + Node; excellent reference for schema definition, migrations, and query API.

Fastify documentation — the fastest production HTTP framework for Node; comprehensive plugin system and schema-based validation.

pino logger — the standard structured logging library for production Node; documentation covers transport, redaction, and performance.

Node Weekly — weekly newsletter; the best single source for Node.js news, releases, and notable articles.

JavaScript Weekly — broader JS ecosystem news including V8, TC39 proposals, and tooling.

GitHub: nodejs/node — follow the repository to see what's actively being developed; the issue tracker is where breaking changes are discussed before they land.

TC39 proposals — track upcoming JavaScript language features from proposal through Stage 4 (standardized).