If you win at least 5 Multiplayer matches a day you will earn free Gems by claiming the victory bonus.
Eternium Buildings and Defenses
Your first priority is to make sure you build enough storage buildings to store enough Eternium for your next HQ upgrade. It is important that you make sure that these buildings are heavily defended to keep the Eternium safe. This will mean that you need to keeping your defenses on the max level that your HQ allows.
Invasion Landing Site
As you cannot see the layout of your opponents base as it is shrouded in darkness from the thick layer of fog finding the ideal landing spot for your invasion is much harder than in other similar strategy games. If you include multi-rockets in your invading arsenal you will be able to recon the enemy base quickly and thoroughly without sacrificing your troops. Look for a blind spot that is near a resource you are after or near the enemy HQ.
Join a Clan
Once you have built the clanhouse building at your base you will have the option of joining a clan. It is beneficial to join an active clan and earn stars by winning battles as your contribution willhelp to fill up the Daily Mission and Weekly Mission meter which once full will earn you Part and Gems for free.
Protect your Eternium
Eternium is far more valuable than Gold as it is needed for constructing your armoury and HQ while Gold is used for upgrading your troops and mines. It is advised that you keep you Gold and Eternium buildings separated from each other on different sides of your base and focus on keeping your Eternium protected as this is the resource you need to upgrade your guard towers and other defenses. The best way to defend your Eternium buildings is to place your defenses in a ring around them. Even if your opponent achieves victory and your Gold is looted in the process you will at least still have your precious Eternium.
Spend Resources
You can help avoid being raided when you leave a session for the day by spending as much Gold and Eternium as possible. Basically the more resources you have the more attractive your base will be to other players to invade. Even if you can't upgrade units you can still upgrade your mines since they are the only constructions capable of upgrading with Gold. The ideal situation is to leave the game with less than 1,000 Gold and your Eternium in storage.
Watch Replays
After you have been defeated check out the Battle Logs at the main screen to replay the match video and learn where you went wrong so you can make the necessary adjustments in your gameplan to avoid getting beat that way again.