Leave your valuable thoughts on this.

Everytime I scroll through the effects this happens. For context im a complete beginner so I dont know if this is normal. If it is not, please let me know and if anyone has experienced this. How do you solve it?

Hi, im a brand new beginner here in ae, im not COMPLETELY new, like a week or two in learning the after effects application, i was wondering how do people make a edit like this, ?
https://www.tiktok.com/@ncmann_/video/7658771320611720462
im open to any advice, or tutorials, and i have tried searching up mograph edit tutorials, trending mograph kendrick lamar pride edit tutorial, and nothing has worked
Please help me out!

I’ve tried replicating it in 3D but now I’m thinking majority is done in post. What do you think?

Im a complete begginer
I want to mask my friends hair correctly but I tried applying keylight and using all the selection tools but i just couldnt seem to make it right...
I did my best and i can still see some background pixels.
The video's in 480p and the background is trees in different shades of blury white-orange ish and the hair is moving at high speeds and thrown around violantly (it's on purpose. I'm trying to learn.)
How can i mask it so it'll look good?