Because “Git” is the technology. GitHub is just one site that works with it.

Drink more water! Whenever I find myself grumpy, the culprit is usually dehydration… It makes everything harder IMO. Ymmv etc etc anecdata

I second this. I have one small cup of strong black coffee in the morning since that’s all I can take, and then I switch to a thermos of hot loose leaf mint tea – probably 4 cups a day or more. It’s just so much more interesting than water, and helps keep things settled