user11071: Are there any tools that can find weaknesses in your games based on your Lichess history (eg, you often play a particularly bad line in a certain opening, or often fall for a certain trap), and then perhaps offers training to help rectify it?

user825: Yes. Certainly. AimChess does exactly that. You may want to pay for it.

user3884: I agree that AimChess is a paid service that seeks to give you customized answers using some fancy machine learning algorithms and normal engine play.
However, I think you can recreate most of this yourself from some combination of openingtree.com, the default opening book, and lichess insights. Specifically, I'd first look at openingtree and your insights to see which openings you struggle with. Within those openings, see if there are lines you are going for that are suboptimal by comparing your play against the masters database. Are you comfortable with the resulting positions you're getting, even if they are "best" play? If not, you should look at a collection of master games from those positions and see if you can guess the move. If you are aware of what to do but just don't like the positions, maybe you should look at different move orders that avoid the openings themselves.
Lichess insights on its own can also show you if you're too often moving your queen in specific openings, or if you are too rash in pawn moves, but nothing will ultimately beat you just putting in the time and energy to explore options within specific openings and see what typical plans players much higher rated than you attempt.

11071: <p>Are there any tools that can find weaknesses in your games based on your Lichess history (eg, you often play a particularly bad line in a certain opening, or often fall for a certain trap), and then perhaps offers training to help rectify it?</p>
 825: <p>Yes. Certainly. AimChess does exactly that. You may want to pay for it.</p>
 3884: <p>I agree that AimChess is a paid service that seeks to give you customized answers using some fancy machine learning algorithms and normal engine play.</p>
<p>However, I think you can recreate most of this yourself from some combination of openingtree.com, the default opening book, and lichess insights. Specifically, I'd first look at openingtree and your insights to see which openings you struggle with. Within those openings, see if there are lines you are going for that are suboptimal by comparing your play against the masters database. Are you comfortable with the resulting positions you're getting, even if they are &quot;best&quot; play? If not, you should look at a collection of master games from those positions and see if you can guess the move. If you are aware of what to do but just don't like the positions, maybe you should look at different move orders that avoid the openings themselves.</p>
<p>Lichess insights on its own can also show you if you're too often moving your queen in specific openings, or if you are too rash in pawn moves, but nothing will ultimately beat you just putting in the time and energy to explore options within specific openings and see what typical plans players much higher rated than you attempt.</p>
