If you don’t have any pals who play, just choose ‘Posse Up’ from the online menu and the game will match you in with a group of strangers. Grab some friends and join up together as part of a temporary squadron whilst you’re roaming and completing missions - if you’ve got a dedicated set of friends, it might even be worth shelling out for a permanent posse.
Everything is a little bit more efficient if you’re part of a Red Dead Online posse.
