Units
Make sure when putting together your army you have different units from each manufacturer so you are able to adapt to any situation on the battlefield.
Pair Units
Pairing units of different colours together is a good strategy, for example send a tank in with an infantry unit, or a recon vehicle in with another recon vehicle. Deploying pairs in the earlier stages of the battle when the enemy tends to deploy a single unit at a time will allow you to defeat them easily.
Enemy Deployment
Remember that resources generate slowly so early in the game wait and see what the enemy deploys before making a decision on what you are going to do otherwise you could find yourself in a lot of trouble if you lose your first unit right away.
Hanger
Take the units that you do not use to the hanger and scrap them for parts which you can then use to increase the stats of your preferred units. Level up and equip your units with unlockable perks whenever possible so they are at their peak performance.
Research
It is important that you always have research queued up as researching new abilities provides permanent passive bonuses such as critical chance increase and ability improvements for example to all your units.
Assignments
These are basically quests that you complete during Campaign mode to earn a reward in the form of a construction. You can only consturct one building at a time so you need to work on completing these assignments so you are able to build more. If you are not sure what to build next simply look at the assignments and see what you have not done yet.
Free Chests
It is important that you do not skip the free chests in the Officer's Club when they become available every couple of hours or so as you need different units from each manufacturer to ensure your army stays flexible. Enabling notifications for this game will help you not miss them.
Ariel
Unlock the three-star yellow recon vehicle named Ariel by completing a certain amount of missions and then scrap your lesser vehicles to upgrade and improve it with their salvaged scraps. This vehicle has the capability of decimating anything the enemy team throws at you.
Cheetah
Checkout the video below to see why the fast killing machine called the Cheetah is such a good unit to have.