How to get better at chess?

@1
"I play every day" ++ Good
"I dont get better" ++ Analyse your lost games and learn from your mistakes.
"What is a good time mode?" ++ 15|10 rapid. It is the official time control for rapid competitions like the World Championship. It is long enough to make analysis worthwile. Thanks to the increment you can always win a won position or draw a drawn position.
"blitz games are fun but probably not so good for learning and getting better?" ++ True
"Is it worth getting membership here?" ++ It helps, but is not necessary
"The most useful tool seem the analyse" ++ Yes
"Are they good and helpful?" ++ Yes
"What are some good chess books for my level?"
++ Chess Fundamentals - Capablanca. It contains in 60 pages all you must know.