You can prevent files from being added to a Git repository by adding them to a
.gitignore file. However, if a file was previously committed to the repository and you want to remove it and ignore it from now on, you need to perform an additional step.
First, update the
.gitignore file to ignore the file in future:
Then remove it from the repository:
git rm --cached foo.txt
The local file will be unchanged, but Git will consider it to have been deleted and will ignore it when adding and committing files in future.