What should I learn first about async in Node.js?
Sync vs async. Understand the difference between blocking and non-blocking code, why Node.js is non-blocking, and what happens when the main thread is blocked. This is the foundation everything else builds on.
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More FAQs in A Roadmap to Mastering Async Programming in Node.js
In order: sync vs async, callbacks, promises, async/await, the event loop, libuv and the thread pool, streams, and production best practices. Each step builds on the last into real understanding of Node.js's concurrency model.
After you understand async/await. The event loop explains why async callbacks run in a specific order, which you can only appreciate after writing async code and wondering about the order of execution.
Because streams are an advanced async pattern for large data. They build on understanding callbacks, promises, and the event loop, and keep memory low for large inputs, which is essential for production apps.
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