White: ruy Lopez or Italian
Black: caro-kann or kings pawn
for white: the English, super solid and very easy to play, you get the center very easily and in certain variations you start a kingside pawnstorm For black against e4: the french For black against d4: nimzo indian/queens indian
King's Indian set-up. KIA for white, KID for black. After you're very comfortable with that, move to a different opening to expand your knowledge.
I wanna to simply stick to only 2 openings and master it to its core to help speed up the process to the middle game.
My goto opening are
White: Italian
Black: French