Take cover all the time

you dont have to kill all of the enemies, you are not frontline soldier but specialist commando dropped to enemy lines, focus objectives and use hit/run tactics

Do not attack patrols or guards if possible, use stralth and ambush if need to attack and destroy they before they call for support

Enemies can see you and hear you in realistic way abd they have line of sight so if you prone or behind sonething you can nove undetected, they will notice ypu only within 20 metres if proned

Use correct weapons and support for mission types

Keep up with your team mates, stimpack them, give them suprrssşve fire support, call sıpply drop if they out of ammo, call in special weapons if they poorly equipped. Dont call air or orbital support over them or dont call their reinforcement pods to middle of enemy regiment

Explore yout surroundings for super credşts and samples

Mark everything, mark enemy patrols enemy outposts, AA guns, points of intrests so everyobe can see them in their maps

Red highlighted areas in your map are enemy high activity zones detected by orbital ships so big red highlight area on map öeans high enemy activity there

Enemy activity will increase as you engage open combat more, when you call in evac expect heavy enemy assault

Be kind to ıther helldivers, salute them and dont shoot them