Node.js
The pages describe Node.js 24 LTS.
What Is Node.js
What Node.js is, V8 and libuv, the thread pool, non-blocking I/O, when Node fits and when it does not, release lines
Event Loop in Node.js
libuv event loop phases, process.nextTick and microtasks, setImmediate vs setTimeout, timers in Node.js
Module System in Node.js
CommonJS vs ES modules in Node.js, how Node.js picks the module type, require(esm), module.exports vs exports, resolution and caching
Error Handling in Node.js
Operational vs programmer errors, system errors and codes, error handling in callbacks, promises and EventEmitter, unhandled errors, Express middleware
Modules
7 items
Socket.IO
Socket.IO vs WebSocket, transports, events and acknowledgements, rooms and namespaces, scaling with adapters