In-Game Challenges and Rewards:
Try to complete the Special Challenge and Daily Orders whenver possible as doing so will earn you Company Coin which can be used to unlock weapon and vehicle progression options. They also allow you to purchase cosmetic items such as face paint, jackets, and weapon skins. Special Assignments are a series of in-game tasks that Challenge your sills on the battlefield while Daily Orders tend to be smaller challenges that rotate daily. These can be things like destroying a set number of enemy vehicles or resuppling teammates a certain number of times.
Unlike most first-person shooters you will find it impossible to accurately shoot in this game while moving. To have a better chance of hitting the target you need to stay still and where possible, crouch or go prone when aiming.
Throw Grenades Back:
If you immediately use the interact button to throw back a grenade that has landed at your feet there is a good chance you will pick up multiple kills from that quick move because the enemy will not have time to get away from it.