Documentation for GSAP in Storyline 360

No need to download GSAP as its already in Storyline360. Only the bonusplugins are not. Check my posts to see what version GSAP in Storyline360 now is. Or run this code in your console..and it will return the version... gsap.version

For GSAP itself your best bet is the GSAP site.
https://greensock.com/gsap/
https://greensock.com/docs/
Top notch documentation ( Articulate take a look here ! ) and great samples and help from a very active forum.

Biggest thing to learn and watch when using GSAP in Storyline is selectors. You could use jQuery...or Vanilla javascript... in my posts quite a lot about it.

Also you need to be aware of several Articulate/Storyline pecularities. Eg. scope of triggers... and offcourse Storyline Player issues. As the Modern Player behaves quite different then the Classic Player your code and animations need to take care of that.

Another thing to watch is that Articulate converts the html in Storyline, both for Web as for LMS to their own kind of HTML. All text is put in spans and converted to SVG.. to name some of the pecularities. They for sure have their reasons for this, but in the end its no standard HTML5 anymore.