I'm around 1000 on chess.com blitz (5min games), and found a lot of useful stuff here. Especially the positioning is what I feel like I'm losing on at the moment. I don't do big blunders anymore, but somehow I'm often in a worse position than my opponent.

I started a few months ago, and have progressed nicely. But lately I've been stuck. Looking up resources, they have often been too simple ("learn chess, this is how the pieces move") or too advanced ("5 variations of opening X" isn't very useful at my level of play).