subsctiptions:
https://github.com/<user>/<repo>/subscription

RSS/ATOM:
https://github.com/<user>/<repo>/releases.atom

New repo:
git remote add origin git@github.com:<user>/<repo>.git
git push -u origin master

access-ssh
https://help.github.com/categories/ssh/
https://help.github.com/articles/using-ssh-over-the-https-port/

payments
https://github.blog/2020-04-14-github-is-now-free-for-teams/