[natded]

This covers it up well:

https://developer.mozilla.org/en-US/docs/Learn

If you click through there are "Intermediate Reintroduction" to JS / web dev there somewhere and some more advanced material.

[aj_nikhil]

Thank you. Do you think ReactJS, Vue JS are mandatory for beginners?

[natded]

Not really mandatory. Check out whatever jobs you are interested in if they ask for React or Vue learn one or the other. MDN is the single best source on learning web dev, so trust it over stackoverflows etc.