Git untrack the file

The series of commands below will remove all of the items from the Git Index (not from the working directory or local repo), and then updates the Git Index, while respecting git ignores. PS. Index = Cache

First:

git rm -r --cached . 
git add .

Then:

git commit -am "Remove ignored files"

Googled : 3 ways of excluding files

.gitignore applies to every clone of this repository (versioned, everyone will have it),

.git/info/exclude only applies to your local copy of this repository (local, not shared with others),

~/.gitconfig applies to all the repositories on your computer (local, not shared with others).

actually requires to set a configuration on your computer :

git config --global core.excludesfile '~/.gitignore'