im a kid and need a coach for free I’m stuck at 100 ELO

You don't need a coach. You need to find out how to study by yourself.

Even though I'm 800 elo in rapid I could coach you for free if you want

What exactly is the point of having a chess coach with a low Elo rating? Once again, you get what you pay for, kid.

Just play have fun learn and most importantly watch gotham chess

Try this link and book . . .

https://www.chess.com/forum/view/for-beginners/beginner-to-intermediate-5-dubious-traps-you-need-to-know?page=1#last_comment

If you are not improving and want a coach for free here I'm! I'm offering free coaching for everyone even to 1700+! And I'm not alone! My discord server has 1700+ rated coach(es) and I'm the 1st coach here! Check out my blog with the discord server link : https://www.chess.com/blog/SmasherBroYT/stuck-at-the-same-rating