If u are below 1500, then learn these openings by heart.

Best opening to play as white: e4 ==> Ruy Lopez

Best opening to play as black: c5 ==> sicillian defense

Comment your most played openings as white and black. 

King Indian ?? Idk man

yes. Sicilian defense is great. most of my opponents didn't have any idea about how to proceed with attack.

I just hit 1500 today

Just don't play dubious openings like me...see what happened in the tournament. Hilarious! https://www.chess.com/blog/Abemo/the-pathetic-patzer

I always play Alapin variation because most of the moves are pretty obvious. I have seen higher rated players getting pissed off when they lose/ have disadvantage

Black: against e4 French, against d4 KID, against c4 or Nf3, Nf6 hopefully with KID transposition

White: e4 Italian, and d4 Queen's gambit

London System Easy win

Black you say? the dragon and dutch

Best opening to play as white: queen pawn opening

Best opening to play as black: king pawn opening

This doesn't make any sense, against d4 you cant play the "King Pawn opening", also this is not even an opening it leads to other openings,

those who plays king indian are above 1800. -__- 

I don't know any theory behind king indian defense.