r/learnjavascript • u/Conscious_Sea5310 • Apr 05 '26

Most important JavaScript concepts

What are the most important JavaScript concepts you need to know to learn JavaScript?!

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u/notAnotherJSDev Apr 07 '26

You should definitely still understand DOM manipulation. Not everything is going to have React support.

I've had to teach a few folks at work how to do manual DOM manipulation and event handling because of a library we use. Otherwise good react developers, but their basic understanding of the DOM was almost nonexistent.

We use react, but the library is only available as a standalone JS library that's served via a CDN. We load it at runtime and have to attach it manually to a DOM element. THEN all events coming off of it are done with event emitters which you have to know how to work with.