Nice post, it is indeed very important to castle early, I've learned this enough the hard way.
how to know when to work on openings
If you need help, please contact our Help and Support team.
If you need help, please contact our Help and Support team.
If you keep losing a piece during a game then studying tactics will be much more helpful.
If you have even endings and lose at that part of the game then studying endgames is a better option.
I hope this helps. Good luck and happy studying!