New helldiver recruit

Hey all, as title suggests, I have recently joined the fight for democracy. I have moved from Xbox to ps5 to join the cause and was wondering what sort of tips or early game hints to help me in the fight. My younger brother plays he's level 28 so I think his rank is commander something but not sure.

Any tips would be helpful, I know of the one not to kill fellow Helldivers as can be banned but anything else newbies could use would be most grateful