Where to learn complex and complex web animations/transitions?

Question

css

Has anyone come across courses on advanced animations using js/js plugins/css?
I searched on various sites with courses and lessons, but I did not find anything other than simple animations.
Here are some examples of sites that can help you understand what level of animation and transition courses I'm looking for:
1) https://itmeo.com/brut-premium-wordpress-theme/live/#!
2) https://www.raoul-gaillard.com/
3) riccardozanutta.com
4) https://waaark.com/works/