Node.js

Node.js is deceptively easy at first. Spinning up a server takes four lines, and that leads many people to production without understanding the event loop, async error handling or why one slow query blocks every user at once. The courses here are chosen by how much they insist on that unglamorous part: input validation, errors, transactions and project structure. It is the same thing we review when we audit someone else’s backend.

Who it is for

• Anyone already writing JavaScript on the frontend who wants to close the loop on the server.
• Developers coming from synchronous languages who struggle with the async model.
• Teams maintaining a Node API who want to stop firefighting.

What you will learn

• The event loop and what "non-blocking" actually means.
• Express or NestJS with a structure that survives the second developer.
• Data access through an ORM, including transactions and migrations.
• Authentication, input validation and error handling as a cross-cutting layer.

Recommended order

1. Async first: promises, async/await and the event loop.
2. A framework and a database, building one complete API end to end.
3. Security and deployment at the end, with something of yours already running.