I haven't coded since I wrote COBOL on a mainframe in the1980's.

I have an account on Github, I also self host Gitea on my Start9 node, where I keep copies of Bitcoin core and mempool amongst other projects.

Do you have any specific advice for an old timer to rejoin the modern world?

Specifically, I have no idea how to pull (install) any app on Github, despite being reasonably competent Linux admin. 

 Mike, I am retarded, just need to get that out of the way.

But from command line I put git install “URL of GitHub repo” 

& it usually works 

 We are all retarded here fren. 

Sometimes you need to say the obvious stuff out loud. Thank you.

I’m not sure whether I have the time or patience to re-open the failed coder in me, you might have opened yet another rabbit hole to go down. 

 git clone <repo url>.git

The green button on top has the full link