How to ignore new files or changed files in git

How to ignore new files

Globally

Add the path(s) to your file(s) which you would like to ignore to your .gitignore file (and commit them). These file entries will also apply to others checking out the repo.

Locally

Add the path(s) to your file(s) which you would like to ignore to your .git/info/exclude file. These file entries will only apply to your local working copy.

How to ignore changed files (temporarily)

In order to ignore changed files to being listed as modified, you can use the following git command:
git update-index --assume-unchanged

To revert that ignorance use the following command:
git update-index --no-assume-unchanged