Hey look at that. Developer Bohemia Interactive worked with a fan to produce some player guides. It's like Bohemia actually cares about their players! Seriously, it's awesome to see a studio work so closely with their fans in order to allow everyone to have a fun experience.
In this particular guide we get some tips on how to be a good team player. Essentially, it breaks down to actually communicating with your allies. You can't just go around being a lone wolf, you need to work together here.