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Event loop, non-blocking I/O, the Node.js architecture, CommonJS vs ESM, global objects, and process.

fs module (sync/async/promises), path module, Readable/Writable streams, piping, and buffers.

The http/https modules, creating custom servers, request/response handling, net module, and WebSockets basics.

package.json, npm commands, semantic versioning, lockfiles, module resolution, and publishing.

Callbacks, Promises, async/await, error handling, util.promisify, and async concurrency patterns.