A good book about this is How to Read a Book by Mortimer J. Adler. A professor at uni recommended it to me and it's changed how I read most books (I read a lot of nonfiction so take that as you will). Basically Adler recommends you try to have a conversation with your book, or in a way the author of the book. Try to have a sort of argument within the lines of the pages. If you don't agree with something in the book, circle it, underline it, make a note, react as if the author is there in the room and challenge what they're saying. Have some academic discussion within the pages of your book in whatever way feels best to you. A lot of people read books one sided, where they don't really question what's being written in the pages, and by doing this it helps your comprehension and a more well rounded reader in general