How to remove already tracked file and add it to .gitignore file

It shows how one can remove already tracked file from git repository and add it to .gitignore file so that it longer seen by git. To accomplish this, first we remove tracked file from local git repo as well as from remote git repo i.e. github and then add that filename in .gitignore file to ignore it.

[antonkharlamov]

nice tutorial, but here is one thing - it would be better to have tutorials with using not UI commands but console ones :)