Wich techno for smooth animation on website

I'm creating my personal WP theme, and trying to make some effects on my background. For the rest of the elements transitions I use CSS animation. But for the images and background I'm wondering wich techno is the most relevant to use for that.

For exemple I want to copy this kind of effect :
https://360pm.net/ (the spiral distortion on mobile and web, and also the movement on touch)
https://360pm.net/projects (the zoom out on the background, and the change of background when you pass hover an element)

I see that they use webGL with three.js so I installed already the NPM three.js and I'm trying to learn about it but it's a bite complicated, and I don't know if it's the best for that ?

If you have some tips please tell me what you know :) Thank you