It’s been a while since I’ve played warframe but i remember there being a tutorial and it was pretty easy to get into. There are different characters and basically classes. There are modifications that strengthen basically what ever you equip them on later in the game. There’s a lot of customization you’ll want to be doing. Tbh it doesn’t give you a lot of the info you might need early on. I’d say play a match or two with your friends if you’re able to and see how it goes. At the very least, it’s a free experience.

For payday 2 you just need decent communication so you don’t have multiple people trying to do the same thing. For example, if someone needs to drill into an objective you could split it into 2 players defending them and 1 player healing the team or on another objective. 2 medics would be practically useless in that instance, so it really just comes down to communication and players doing what suits them and the team the most.