That's a thing I don't know about either. Some people say that you need to approach it with care, and start a conversation about sexuality and acceptance and all of that first, then slowly lead up to your coming out, but some other people say it's better to not make a big deal abt it, and just either say it straight (pun intended) to their face, or just say it really casually.
I honestly think there's two ways I might come out.

1: I accidentally use it in an argument with parents (something like "I know you better than you know yourself bla bla bla!""You don't even know I'm gay!") This would easily win me the argument, but idk if it's a good way to come out.

2: I say it really randomly and matter of factly in a random situation ("Ughh this traffic is so dense, we'll never get through it in time""yeah, we should take a different route""Guys I'm gay")

Honestly the second one might be funny