You might research academic books aimed at networking and security certification tests.
You don’t necessarily have to take the tests, but they tend to be aimed at what is considered industry-standard knowledge.
Like I’ve got an old copy of CompTIA Security+ Guide to Network Security Fundamentals by Mark Campia aimed at passing the CompTIA Security+ certification test.
There’s plenty of other books like that, that’s just an example. Research which industry certification tests sound like what you’d like to know and then find a book aimed at passing one of those tests. They tend to be pretty competently structured.
You could always turn to libgen or anna’s archive for copies, as well.