How can I master GSAP in order to make website like

Hi, I found is cool with animation effect, I saw it is made with code like GSAP, bodymovin(aftereffect plugin), Pixi. Where can I learn effectively for them? Thanks.

I suppose on the GSAP website.
Your post attracted my attention because I read a bit about GSAP and it appears to be the best solution for web animations out there. It’s on my “to learn” list.

Thanks, yes, GSAP website has many resources, but I want to learn specifically on web page transition for interface and animation, and I can only find few website related to this and too basic. One reason I want to learn GSAP because I started to learn design when I came across some cool flash websites, now I feel the wave of web animation returns. but the requirement now is much higher as coding required.