What's the best way to study opening theory? Meaning sites and considering I don't belong in a chess club. Also I only know two openings, London and Caro-Kann and as I have a considerable rating it's hard for me to play new openings as I just don't know enough theory and quickly get into a bad position which ends in a loss.
Chessable is great as they have a Spaced Repetition tool embedded (MoveTrainer). It tests you repeatedly on your opening moves, and more frequently for the ones you made mistakes. If your openings serve you well, perhaps you don’t need a change. Instead, you can deepen your middlegame knowledge in your openings and learn typical plans in those pawn structures.
Hey! I am 2100 Rapid, and I play slow chess and learn new things every day. I aim to become a Candidate Master like you as a young adult. What were some of the game changers that brought you to achieving such a feat?
Good luck! I always loved chess classics and looking at players that play my openings. I also did guess-the-move training, by actively guessing the moves of the grandmaster playing my openings. Active testing instead of spoon-feeding the solutions. This helped me connect the opening to middlegame and endgame and simulated a real game environment. And most importantly, I enjoyed that training a lot! But it is also important to seek feedback on your mistakes and ask yourself why you could not guess certain moves. Then you target those specific weaknesses in your training.