Please Tell us what’s happening in your own words.
Learning to describe problems is hard, but it is an important part of learning how to code.
Also, the more you say, the more we can help!
The lesson says
Find the h1 element and change its text to:
CatPhotoApp
You have made many more code changes then you need to. I would reset the lesson using the button that looks like a circular arrow and read the instructions more carefully.