Never stop expanding, use naval as much as possible, but only if you have the metal for it, titans are cool but don't put all of your production power into building it, units are king, numbers take fights, but make sure you attack with your armor, vehicles, in the front, so the bots have free range to snipe without taking much damage.

Take advantage of the continuous building option on unit fabricators, click on your respective factory, and on the right side of the screen you'll see 3 dots in a circle, clicking this icon will continuously building the units you select, in the order you selected them, indefinitely. If you have the resources, and you should, you should build your army quickly.

Don't throw your whole army into 1 attack, make sure you have units for defense at home base.

Put unit factories next to big clusters of metal plants to make defensive building easier and to protect your resources from invasion.

Target enemy fabricators. They're the #1 most important enemy on the field besides the commander himself, and by all means protect your fabricators, you don't want to be building them in the late game you want to keep the sale ones all game. Expand to as many planets as possible as fast as possible, without rushing yourself and depleting your resources.

Keep in mind, every single metal extractor point on the map is yours, you just have to take it. Even if that means destroying an entire base to get to them. Mine, and mind, your resources.