Learning tips. Using JS to add functionality to a website

Dear Campers,

I am now slowly going through the Front-End Libraries certification section and at the same time, I decided to do a side project and build a multi-page website in order to practice scss and JS. However, I do not really know how to apply JS . I mean like i do not know the syntax, which would allow me to make a dropdown menu and this kind of stuff. I would really like to learn that. Therefore, I wanted to ask for some tips, where I could learn how to use JS in order to add some functionality to my website. Could someone maybe recommend me some platform or resource where I could learn that? Or is there such a platform at all?
I tried to google, but could not find so really any relevant platform.
I am completely lost here, I do not know where to start and how to proceed. I would be very thankful for any suggestion.

Have a good day everyone!

Best,
Your fellow camper, Basan

what you are searching for is called dom manipulation

for documentation to look at, this can be one:
https://developer.mozilla.org/en-US/docs/Learn/JavaScript/Client-side_web_APIs/Manipulating_documents

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thank you very much!