JS integration from e.g. GitHub

Hello,
a (I assume) simple question from a non coding person.

I´ve searched for Parallax animations and found quite some stuff on GitHub. E.g. Locomotive scroll which looked like a great pool of effects.

I´ve tried to integrate different JS stuff from GitHub, or followed the SimpleParallax thread here in the forum (which unfortunately did not work).

So I think, I need a general tutorial how to integrate JS stuff (and additional CSS) - is there something out there? :slight_smile: