New file to existing GitHub repo?

Question

git

Good day, how can I add a new file to an existing GitHub repository?

Answer 1

git add
git commit
git push
Seriously, read up on some Git basics. On the same github, for example

Answer 2

git status - see what's happening there,
git add -A - add all changes
After that, you can see the difference by repeating git status.
If everything is as it should - commit, and if necessary to the remote - push.