Having confusion in middlegame

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Avatar of GMArpan_2010
I could not figure out what opening should I play when I was 800 on rapid..I was playing the 4 knights game in every game...But when I saw some videos from free online resources I chose London, Ponziani and Vienna for white and King's Indian and Scandinavian for black...Now I am 1250 on rapid..But still I get into some problems during the middlegame..The main problem is that I can do some tactics...I am also 1900 on puzzles..But I can't defend at all in the middlegame ..Can you guys recommend me any kind of advice??
Avatar of tygxc

@1

"I was playing the 4 knights game in every game" ++ Good.

"I saw some videos" ++ Do not watch videos: that is passive learning. You cannot learn to swim, ride a bicycle, or drive a car from a video and chess is the same: you have to do it.

"London, Ponziani and Vienna for white and King's Indian and Scandinavian for black"
++ Those are good too. But pick and stick to it. Each time you switch openings you lose more, not less. It takes time and losses to accumulate experience.

"I get into some problems during the middlegame" ++ We all do.

"But I can't defend at all in the middlegame" ++ Attack and defense are the same.
A good attacker anticipates defenses. A good defender anticipates attacks.
Here are two great defensive games for you to study:
https://www.chessgames.com/perl/chessgame?gid=1095025 
https://www.chessgames.com/perl/chessgame?gid=1042835