Not Expanding Fast EnoughIn smaller 1 vs. 1 and 2 vs. 2 games you often have to get an expansion very early. Clear out a Gold Mine so you will be ready. You do not want to have to start an expansion as your Gold Mine is running out. Not Giving Resources to allies before leaving the gameIf you have to leave a game and your allies continue playing, open up the allies menu and give all your resources to your ally. This may help them win the game. Allies will still be able to control your buildings and units after you leave the game. It’s just better for them to spend the resources on their troops rather than on yours. Not Taking Control over dropped players towns or towns of players who have left the gameOnce a player drops from the game or leaves the game, allies can take control over that person’s town. Take advantage of this. Using Move instead of Attack-MoveLearn more here. Building Massive Tower DefensesSiege Weapons and other abilities can easily kill tower defenses. You only need enough Towers for a defense — don’t build too many. Building Tower in the middle of nowhere for no reasonFor towers to be effective you need them in your town, or to prevent the enemy from walking around them. A common mistake is to place towers outside your base that the enemy can just walk past or around and reach your town. When you build towers place them IN your town, or at least prevent the enemy from walking around them using your army or by walling yourself off. Not running past TowersSimilar to the above, if you can walk past towers and reach an enemy town out of range of the towers, do so. Standing in TowersDon’t stand in the middle of towers. Bring Siege Weapons and kill them from range. You should only attack towers if you have superior numbers and are sure to win the battle. Constructing buildings next to the CreepsCreeps will attack new buildings. Cancel the building if the Creeps attack it. Kill the Creeps or build away from them. Not Upgrading UnitsResearch upgrades. Your units will benefit greatly from being upgraded. Armor and Weapon upgrades are especially important. Ignoring attack limitations such as units that can be used against air units or air units that cannot attack other air unitsLearn the units and their capabilities. Not Knowing the MapAs you play a map more you learn how to get around. You should try to learn every map that you might have to play. You can do so in custom games with or against the Computer if you have to. You can also look at Map Pictures No ReconLearn to scout. Ignoring UpkeepYou should avoid High Upkeep unless you are very rich. Getting Heroes or Workers Stuck Between BuildingsAlways make sure when you build a building that the worker or Hero has a way of getting out when they are done. If you’re not careful, you can end up walling in your worker or Hero with buildings or trees. If this happens, you either have to destroy a building, kill the worker, or purchase a Goblin Zeppelin to get them out. You can also kill the unit to free up food.