How to Sign Up for Things

Every app, every website and everything out there now is like, hey, do you want to sign in with your Google account? Or pick an account orDo you want to use your email? Like if Apple's not a choice, I pretty much am like, yeah, I'll use my email. When you use the OAuth 2 stuff like the Google, the Facebook, the Twitter, the whatever, whatever, whatever,. they can request information about your account. So who's that you're going first? I'll go first.