How to set the path to a file in git?

Question

git

Can you please tell me how to write the path?
For example, I have a main folder in which git is initialized and in the same folder there is an app folder in it index.html.
For example, I want to roll back changes to this file, how can I set the path to it?
git --cheackout file path ?
Total two questions
Please tell me how to move to the file in general and back to the folder with the git?
Well, how to write the actual path to the file?

Answer 1

git checkout -- ./app/index.html

Answer 2

git statuswill show all paths to files that can be checked out (if there are changes)