Sharpening my skills

I have looked at your games and I see something your missing. You need to review your games and go look for the best move from your previous games. Your accuracy is really good. The puzzle rush score can be higher... but you have the talent :-) The coach explanations from diamond membership, that will give you the puzzle excersise you need to go practice. It's certain moves your doing in the face of danger or uncertainty. Those moves are the only problem I can see. I like watching your games. Slow down the time to 10-20 minutes and stick with that to improve your skills from training by self correction, that means those puzzles. Learning openings also teaches your mind tactics and strategies. Puzzle mode custom version, choose a theme until your good at it. After a game review your moves. Don't become robot to the other players. Think what is my oponent trying to do and why did you move that. Don't move to move..
What is the best way to make progress in sharpening my chess skills using this app?
I have very limited time to spend on this app every day (hopefully), let’s say up to 30 minutes a day at most.
I see a lot of possibilities, such as watching other games, solving puzzles, reading articles, playing computer etc. what should I focus on?
I have never “learned” chess, but I played as a kid a bit, so I know the rules and I have good intuition. I have no formal knowledge of any moves/strategies.
My current score is 700-800.
I also noticed that I am losing a lot due to “blunders” how ca can one be more careful, any tips will be appreciated.
Thanks in advance to everybody