Advanced UX & UI animations resources needed

I need to advance my UX and UI animation skills, I did take an advanced CSS course on Udemy, it taught me some nice transitions and animations tricks, things like sliding and fading of a transitioning element, but still I think there is a lot more interesting stuff to look for, I found some really cool showcases but I don't even know the name of techniques used for me to search for It and learn it, here are links to some of them,

  • check the hero section in this example
  • nice mouse moving effects in the home section here
  • very cool interactive effects in this non-scrolling page
  • very rich and nice UX here
  • another one here

One more thing is how can I present my work examples on my portfolio page to have it shown inside a screen of modern devices like Iphone X and other modern cool looking screens, something like in the last link, I just need a direction or some useful links to tutorials where I can learn from, thanks in advance.