Harkonnen: Easy win against the CPU
Build four or more Harkonnen Devastators and for to eight Advanced Carryalls. You may need to build more then 4 when fist attempting this trick -- for beginners start with eight to twelve. Number the Devastators group "1" and each Carryall a number after that (such as 2, 3, 4, 5, 6, 7, 8, 9). Collect all your Devastators and then Transport them to best location in the enemy's base. If they do not have a weak point, you can attack by way of the front door or make a suicide run for the Construction Yard and Factory. If you take the front door approach, just keep your team close, and concentrate firepower on one unit at a time. Remember to take out Laser Tanks and missile-type enemies first. You may go full force, but the CPU is dumb and will send all units to attack -- do not worry, they will be slapped down with ease. If you take the suicide approach, just go for the Construction Yard and then the Factory. Better yet, if the Refineries are close to each other, take them both out and the CPU will sell all structures 90% of the time. Then, all you have to deal with is the last of their units.

Harkonnen: All House units
Capture a Construction Yard of a different House. Make sure you have a Advanced Carryall near and select the Construction Yard. Then, select somewhere else on the map. The Construction Yard will undeploy and turn back into an MCV. At this point you can grab it with the Advanced Carryall and take it back to your base, where you can then redeploy it and build the entire army of your enemy. In this manner you can have every unit (except SubHouse) in one game. With this flexibility you can have the ultimate army.

Harkonnen: Steal Harvesters
Get some Advanced Carryalls and you can steal the enemy's Harvesters. Make sure you do not go too close to your own forces. If you do, then your own Carryall may be damaged or destroyed as your own units try to kill the Harvester. In this way you can keep them out of the game without alerting the enemy that a unit has been lost (if playing human player). The CPU may or may not make a new one, and in this way you can slow them down. This trick also works for stealing any other unit, however it is dangerous because it wont pick the unit up immediately. It takes a few seconds to become airborne, and while on the ground any weak unit can take a pot shot at you.

Atredes: Stopping sieges with Minitowers
The Atredes Minitower unit (huge four-turreted mech) is extremely powerful. Use the following trick to stop the AI's siege with those Minitowers. Get several cheap AA units and an Advanced Carryall unit to pick up the Minitowers, which the AI never escorts. Place them carefully near the AA troops. That will keep the troops from hitting your Advanced Carryall. The Minitower will not be able to fire. This works best for the Ordos. If your Carryall is hit, then it will repair itself.

Destroying powerful enemy units
The CPU always has something powerful available. The CPU usually sends at least eight to ten powerful units at a time. It is important to keep the way enemy units get into your base blocked. To do so, either block it with many infantry, a decent amount of vehicles, or a decent amount of both. Note: Do not use these units to invade enemy territory -- make a certain area where you put those units.

Attack bases
When attacking any base, destroy the Construction Yard, then destroy the Refinery. That will take out their money supply and there units. They cannot rebuild the two buildings because they are co-joined. If you destroy the Construction Yard. the Factory will make a MCV that can rebuild it. If you destroy the Factory first, then the Construction Yard can make another one -- however, if they have a hanger destroy that as well.