Finishing a PhD gives you bragging rights, but it doesn't make you any smarter! (Believe me, it took me 11 years to do mine... and I've got the bills and emotional scars to prove it!)

I might start to teach courses online at some point, but I'm right now so busy with in-person classes in Israel and China (with a bit in Europe probably happening soon) that I haven't had a chance to consider it. But hmm, maybe...

Meanwhile, see my above reply with some suggested resources to learn about and understand Git. I hope that they'll help.