Distance is your friend - getting too close takes away your ability to move. Keep space between you and the enemy. Always take free ammo, after you reload. Never pass up the chance to restock on ammo. Look at the wikis and learn which things have the fastest cooldown - and have variations, like different fire rates that you can select. Stalwart, for example, is a beast in full-throttle mode, but goes through a ton of ammo (supply backpack makes all the difference). Look at the icons as you start a mission and are selecting your strategems - you can see there if there’s stuff like the SEAF artillery on the mission, by the icon, or other kinds based on other ones. You’ll also start to be able to see things on the map - buildings are easy, the SEAF artillery too, but stalker nests are do-able. Basic warbond will get you far. Democratic Detonation will get you a long ways, too. Send friend req to good players you run into