I'll just add some things I think are missing:

* Here's GitHub's guide: https://docs.github.com/en/authentication/connecting-to-gith...

> Before I get killed here for using Excel files for credential storage please note that I have about thirty+ years of excellent experience going that way, have tons of managed credentials and think that millions of users have similar practices.

That's not true and even if it was, it's not a justification to do anything. You know it's wrong, but to be honest it's not my job to convince you that you should be using the right tool for the right job.

What steps did you take to research a good solution on your own? How do the responses here compare? Do you think that asking questions here will have an effect on how you see your current workflow?