commorose brings up a radial menu that allows you to broadcast to your team that you need supplies, or give random orders. If you request health, your icon on their map will blink with a health cross, if you request ammo, it will blink with an ammo pack sign. That kinda thing. People don’t use it 90% of the time.
X jumps
Square reloads
triangle switches weapons
tapping circle crouches, holding goes totally prone.
The shoulder buttons are pretty self explanatory, you seem to have those ones down.
As for the D-Pad, their affect is contextual based on what equipment you have. Some of them may do nothing if you don’t have anything equipped on that weapon.
Up toggles accessories, so it will turn on and off flashlights and laser sight, or switch between scope and canted iron sights if you have that on your gun.
Down toggles firing mode, so if guns have single shot, burst, or fully auto firing modes you can switch between them. If you’re on a sniper or DMR, which don’t have full auto or burst, it toggles bullet drop distance instead. It will have a number of meters on the display at the bottom, and that corresponds to where the bullet will meet with the reticle. For example, if you set it to 1000m (the longest for sniper rifles) and put the cross hairs on a guy at 500m, the bullet will arc over his head and miss. Likewise, if you set it at 500m and shoot at someone at 1000m, it’ll drill in to the ground before it ever hits him. This is usually not importan unless you get really into sniping.
Left and right pull out your gadgets that you equip at the loadout screen. Things like health or ammo packs will be thrown right away, so you don’t need to pull the trigger, but things like underslung shotguns or grenade launchers hitting left and right simply equips them so you can shoot with the normal triggers.
As for general advice coming from cod, team work is more important in battlefield, so play your role.
f you’re assault, drop health kits, rez people when you get the defib (hold the trigger for awhile on the defib to rez people with more health, you get more points). Other than that, pick yuour favorite gun and kill kill kill.
If you’re support, drop ammo for people, it refills rockets and grenades, which can be super important for others. Use the high clip LMGs to lay down suppressing fire, even if you’re not as likely to hit. It helps your other teammates take less fire and get kill shots in.
If you’re engineer, you can go for vehicles. Each takes a bit to get good at, so be patient and try out flying vehicles in the test range so you don’t crash right away. If you go as infantry with the engineer kit, pick anti air or anti land armor, take the right launchers and/or mines, and blow that shit up. Team with a support teammate for ALL THE ROCKETS. Otherwise you’ll only take out one or two vehicles before you’re dry.
If you’re recon, try not to hole up in a nest and take potshots, unless you’re really, really good at it. People will just get pissed. If you’ve got an engineer teammate (or a vehicle) that can lock on to lasered targets, one of your starting gadgets can provide instant locks for them. Useful stuff. You can also go balls to the wall and take out armor with C4.
Good luck man, and remember to have fun and not take it too seriously.
Adit: Also, you’re more likely to get help over at /r/battlefield_4 than here. Way more subscribers.