Usage for JS on websites?

Hi all!
Just finished the fantastic html/css-course and started with JS. When I look thru the curriculum I can not see any relation to websites. Maybe I am impatient, but do we learn in this course how to use JS for websites? For example you can use it somehow to create a hamburger menu for small screens. And I know you use it a lot on websites, but I can not see a chapter about this so far.
Thank you!

After the JS section is the Front End Development Libraries Certification which connects the JS to websites.

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