Some scenarios require mods. I would first either pick scenarios that don’t need mods or need only a few. Mods are subscribed to the same way but you enable them in the Arma 3 launcher, and they will take effect in all scenarios when you have them enabled.
The quality of scenarios varies widely, but the popular ones are usually pretty good.
I messed with that a bit in the early days but it was so janky. Chernarus is my favorite map though.
I played the campaigns co-op, a lot of co-op scenarios, and also a lot of scenarios like Pilgrimage, Antistasi, and all the randomized ones like DUWS.
How do you get into the game modes? I played all the campaign and there’s nothing left
You can play Scenarios (missions) by following these directions: https://arma3.com/workshop101
Some scenarios require mods. I would first either pick scenarios that don’t need mods or need only a few. Mods are subscribed to the same way but you enable them in the Arma 3 launcher, and they will take effect in all scenarios when you have them enabled.
The quality of scenarios varies widely, but the popular ones are usually pretty good.