Actually the chess game is not a refuted game where we can know all the solutions by memory so I find it is nonsense to ask easy openning to learn, just play what you think the best or good moves and focus on the technical aspect of the game such as tactics, endgames, strategies, calculations.
Otherwise 1) e4 e5 sure that it is not the opening that makes you lose
Any valid opening which is easy to learn.I get to 900 elo using caro extremely good ,consistent,easy to play,but get bored of it thay to much.What was your prefered opening around this level?