I have a question about git commit and git add
are we supposed to only add the commit the files added and if we changed or modified a file or do we need to also add the changes in the scripts?
I'm not totally sure I understand your question. You add and commit any time you add a new file or change a file or files, whether it's a file that contains functions or is a driver script. This is true whether the file contains code or some other text (git is used to track text files, mainly).
Yes ok I thought I was supposed to also add the changes I make to the scripts.