What is the best read on backend development?

Question

Books

Good day!
It so happened that I lose a lot of time in public transport, I would like to read a good book on backend development. Moreover, they are interested in books on theory, and not practical manuals, I have them, but you can’t do much in transport.
Thank you.
UPD1: Interested in literature for general development.
UPD2: The most interesting direction is the development of backends for web/cloud applications.

Answer 1

Yes, anything that does not concern the interface or the client. It depends on what area (direction) of development you are primarily interested in.