As others have pointed out, correspondence on lichess is quite different from the "official" correspondence chess, where you can use everything you want, and the stronger players often have multiple high-end computers running 24/7. These days it is extremely rare to find a non-draw game at the top level.
On lichess, games shall be played between humans. If you sometimes want to think longer about a move or don't want to invest time for a classical game, this is a valid alternative. You can use all your chess books, and even the opening browser on the analysis is enabled. To find good moves takes a bit more work though than just playing the move with the highest statistics all the time.
Obviously there are some areas that are not clearly defined, but I think one can work out how it is meant to be played. For example, I consider browsing your Chessable course ok (as it works like a book), but you absolutely have to refrain from running the engine in any position. Engine help is limited to moves, but evaluations as well.
You might look up your endgame in Dvoretsky's EM, but you may not query endgame tablebases.
I have recently started playing some corr games here and try to get some more knowledge of openings and middle game ideas, and make sure to not blunder anything away directly. So far, the accuracy is much higher than in the other time controls (as expected), but sometimes I still make dubious decisions.
And you can always move the pieces before you make a decision, so this alone should make things way better. But in order to use it to learn, always use your head first. :-)
As others have pointed out, correspondence on lichess is quite different from the "official" correspondence chess, where you can use everything you want, and the stronger players often have multiple high-end computers running 24/7. These days it is extremely rare to find a non-draw game at the top level.
On lichess, games shall be played between humans. If you sometimes want to think longer about a move or don't want to invest time for a classical game, this is a valid alternative. You can use all your chess books, and even the opening browser on the analysis is enabled. To find good moves takes a bit more work though than just playing the move with the highest statistics all the time.
Obviously there are some areas that are not clearly defined, but I think one can work out how it is meant to be played. For example, I consider browsing your Chessable course ok (as it works like a book), but you absolutely have to refrain from running the engine in any position. Engine help is limited to moves, but evaluations as well.
You might look up your endgame in Dvoretsky's EM, but you may not query endgame tablebases.
I have recently started playing some corr games here and try to get some more knowledge of openings and middle game ideas, and make sure to not blunder anything away directly. So far, the accuracy is much higher than in the other time controls (as expected), but sometimes I still make dubious decisions.
And you can always move the pieces before you make a decision, so this alone should make things way better. But in order to use it to learn, always use your head first. :-)