About hanging pieces...
In my opinion, it is a matter of chessboard awareness.
I mean : looking where all the pieces are and analysing their activities.
The thought process is important too.
What is the goal of my opponent's last move ? (in the case it is not a check or a capture) Is he able to check, to capture or to put a threat (a terrible fork for example)
And before moving the piece : is the move safe ?
If you detect no check no capture and no dangerous threat, may be that your move is not the best one, but there is a high probability that it is not the worse !
Being aware of the unprotected pieces (or with bad protection) is important too. Look at that point during your opponent reflexion. (included the uncontrolled squares too).
Puzzles are one of the good trainings : analysing the position looking for the weaknesses. Repeating a lot of exercices help you to memorise these principles. Again and again
Train with non rated games against partners or Maia for example. Asking all these points from the very first move until the last one. The most difficult thing would be to systematize all that stuff during all the game.
Playing classical games (at least 30+0) allow your brain to be ready during faster games. Not sure you'll see a real improvement (+100 rate !) but i think you will be more confident.


