How do I make animated popups?

Question

I want to make popups that show content when you scroll down to that specific area, like https://koya.gg/ , but I am unable to properly describe what I want,/unable to find a good tutorial, can someone help me?

Answer 1

Good Tutorial:
https://cssanimation.rocks/scroll-animations/

My Example:
https://codepen.io/ebuelow/pen/wvGyrxJ