I have an online rating of 1900, and about 30% of my lost games have been lost because I clearly messed up in the opening, so I want to focus on my openings to improve my rating further.
I am looking for any specialized tools that would help me study and learn openings (preferably free ones). I know about Chessable, but I'm not a big fan of that website, because I don't particularly like the way MoveTrainer works (I find it boringly repetitive), and the courses are rather expensive. I'm looking for a tool that is more compact/simpler, that is specifically made to learn openings. I love Lichess studies, but there are only a limited amount of community studies available, and most of them don't go too much into details.
Are there any websites/programs you would recommend that would help me learn openings? Are there any specialized tools available for this task, or should I simply get into Chessbase and make my own studies/databases with it? I should note that I am aiming for an online rating of 2200.