git remove tracked files-How to stop tracking and ignore changes to a file in Git?

There are 3 options to resolve I think for the question 3 options that are required such as:

Option1:

To Stop tracking file git, but delete for everyone once they try to pull

git rm --cached or git rm -r --cached

Option2:

This is for optimization, like a folder with a large number of files, The assume-unchanged index will be reset and file(s) overwritten if there are upstream changes to the file/folder (when you pull).

git update-index --assume-unchanged

Option 3:

In this option you will tell git that you want your independent version of the file and you don’t want to overwrite production/config files.

git update-index --skip-worktree

Note: It will not propagate with git, and each user has to run it independently.