as stated in the title I am looking for structured textbooks on chess. I have followed chess.com lessons and I have a rough idea of tactics (forks, pins, skewers, sacrifices, etc) but I feel like I am missing something.
Is there any book that seriously expose the theory of chess, like an academic text would do?
Almost, every book of chess is about chess theory. There are millions!
One fantastic collection is Yusupov Complete Series: https://www.qualitychess.co.uk/products/13/195/yusupov_complete_series_in_hardcover/
Arthur Yusupov is one of the greatest chess players of all time. Moreover, this collection won several prizes for its high quality.
My advise would be to start with book#1: Build up your Chess 1.
The same collection is available on Chessable that is a website that uses a very friendly format. Also, you can access it in any part of the world immediately. Additionally, www.chessable.com gives you a 30 day trial: https://www.chessable.com/the-fundamentals-1-build-up-your-chess/course/19145/
I have returned several books that I did not like without a problem.
If you prefer the classic format, the editorial of Yusupov gives you an exceprt. You can find it in this link: https://www.qualitychess.co.uk/ebooks/Build-up-Your-Chess-1-exceprt.pdf
https://www.qualitychess.co.uk/products/2/16/build_up_your_chess_1_-_artur_yusupov/
Good luck in your chess journey!
