Hi.
I've played RTS games like Dune II, Warcraft, Warcraft II, C&C, Dark Colony, Starcraft, Red Alert, AoE, Dungeon Keeper, Myth the Fallen Lords and Homeworld.
RTS games require the player to prioritize what to do first, which micromanagement to do before others are done, and many traditional strategy players are not very good at that.
In RTS games there is always more micromanagement to do, if one cannot accurately judge the importance of each action, the efficiency is bound to be low.
Of course techniques like learning the keyboard shortcuts are essential to play the game at the highest level.
The most common mistake of weak RTS players is that they are so engrossed in all the details of the game and forget about their main battle strategy, if they ever developed one in the first place.
All one has to do is to exploit that and attack them a little in places they do not expect and it would mess up their whole strategy, something very fun to do.
Unvala.