Section B.1 Make An Account
This is routine, but we have one piece of advice. Choose your username with some thought. It will be part of the URL for your repositories and others will use it to identify you in discussions. It will also be part of a GitHub email address you may choose to use. And so on. If you are doing professional work, it might be best to use some variant of your real name, and if the base name of your canonical email is available, that might be the best. You will have a GitHub profile that you can use to disambiguate yourself.
Pick a strong password, since you would rather not have untrusted individuals changing your repositories, or worse, impersonating you on GitHub and destroying your hard-earned reputation.