Go to your Kratos folder:
cd kratos
And edit the file .git/info/exclude (NOTE: You can use your favourite editor, not necessarily Emacs):
emacs .git/info/exclude
Add the following lines inside the file:
KratosMultiphysics/
applications/python_scripts/
libpython2.7.so.1.0
libs/
Note that some files will change according to your Python version. Feel free to add to this list every folder that you want to ignore.
Close the text editor and run the following command:
git update-index
The folders and files that you added to the file .git/info/exclude should not appear when typing:
git status