Why learn streams last in this async roadmap?
Because streams are an advanced async pattern for large data. They build on understanding callbacks, promises, and the event loop, so they come after you have the foundation. Streams keep memory low for large inputs.
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More FAQs in A Roadmap to Mastering Async I/O in Node.js
In order: sync vs async, callbacks, promises and async/await, the event loop, libuv, streams, and best practices. Each step builds on the last into real understanding of Node.js's core concurrency model.
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.
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.
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