- Always press Q to spot enemies (particularly vehicles) for yourself and your team. Don't spam at random when you can't see enemies though, it has a cooldown.
- The support's and medic's starting weapons are kind of lacking. For the support, the Benet-Mercie is basically a straight upgrade to the starter gun, for the medic it's the Selbstlader.
- Behemoths have certain weak spots that can be destroyed for a chunk of extra damage. For the Zeppelin that's the nose, tail, and a section of hull on each flank right above the engines. For the train it's the individual turrets, and for the dreadnought it's the very front and back of the hull. Additionally, you can destroy turrets and gondolas to disable them temporarily.
- In many situations, the thrown ammo and health packs are actually better than the bigger crates. A single pack will usually completely refill a teammate over the course of a few seconds, while the crates need way longer.
- All the elite classes (that can be picked up on the map) and cavalry have body armour, meaning they can take way more punishment than usual. However, they still have weaknesses: A bayonet charge can kill all of them instantly (cavalry only when on foot, of course), and regular melee attacks are surprisingly powerful as well (backstabs are an instakill). Additionally, the Sentry (big armoured guy with a heavy MG/MP) cannot put on a gas mask, so gas is a good counter against him.
- When you're on fire, you take less damage from it when you're prone, and more the faster you're moving. So stop, drop, and roll as soon as you're out of the radius of whatever set you on fire in the first place.
- Only the pilot/tanker class can repair vehicles from the inside, so don't hop into burning tanks as an infantryman expecting to fix them up.
- Infantry guns actually do fairly decent damage against planes, particularly the support's LMGs and the scout's K-bullets. So if a plane is annoying you, just light it up to drive it away.
- You can rotate infantry guns more quickly by pressing A/D instead of turning only with the mouse.
- And last but not least, the bayonet is life. Put your trust into it, and it will not let you down.
- Get a friend or two to join you, the game is infinitely more fun when you have a squad to coordinate with and spawn on (and occasionally fully crew a tank with).
- If you're in a vehicle, don't be afraid to back off to repair yourself. Getting yourself blown up because you just had to finish off that one dude means that your team will have to deal with being down a vehicle until it respawns. Repairing also works differently in this game; instead of slowly restoring the vehicle's HP, you fill up a bar and then the vehicle gains a bunch of HP at once. The bar gets interrupted if you get hit, so you'll have to get pretty out of sight to make a full repair.
- Big change from BF4 (don't know about BC2): if you're in a close-range firefight and use up all your ammo but the enemy has a sliver of health left, melee him. Unlike BF4, melees from the front are completely safe and deal flat damage depending on your melee weapon, so they'll instakill anyone at low health.
- Elite classes take forever to regenerate health on their own, but they will heal quickly if a medic drops health for them. If you've got a friendly elite class nearby and you're a medic, be the guy who saves his ass. If you're a cavalry don't forget you can drop health for yourself! If you're a support, you can resupply their ammo and grenades.
- As a medic, always equip a syringe to revive downed comrades. If you're downed - check to see if any medics are nearby \ heading out to revive you, and don't skip right back into respawn. On the other hand, if you died in the middle of an enemy cluster, skip so that the medic isn't lured to his death. As a medic, you can Q-spot downed players to let them know you're coming to get them, but remember to check for enemies waiting to take you out before you rush to revive.
- You can pick up fallen weapons to switch to the dead guy's kit. Helps when you're out of ammo \ want to switch classes. In addition - ammo \ health crates stick around even if you switch classes, until destroyed \ until you die. Tripwires and mines stick around even after you die (in general, not just for switched kits).