How did you learn how to play RTS?

I've played a few RTS campaigns (AoE 2, Starcraft 1 and 2), but my strategy (if you can call it that) has always been spending an hour or so building the biggest army I could, then just send them to the enemy and let them go nuts. This obviously is only a reliable strategy for easy difficulties and certainly wouldnt work against a decent player. I'd like to really learn how to play RTS and add some strategy to my real time strategy tactics.

How did you learn how to play RTS games more strategically. Are there any tutorials or streamers you would recommend to really learn this genre?