From a different course: COMMAND LINE GIT Book

[OldSubSailor]

I apologize for posting here, however, the author seems to have abandoned his somewhat buggy book and does not have errata or such. I will more than likely come back here for the course again.
In this instance of the book, he refers us to a repository that he evidently forgot to include in the example download as part of setting a new default editor. That part is easy enough, but heaven only knows what is in the missing repository, and he has us enter the following command after we open it:

git add .

Can anyone tell me what that command does, or ***is more information from the missing repository required for this all to make sense to anyone?

Thank you.

[OldSubSailor]

Silly me, I found it on a google search.
git add . >>>>> : adds the entire directory recursively, including files whose names begin with a dot
So in a way, yes***

https://github.com/git-guides/git-add