Start with http://www.man7.org/tlpi/index.html
Regarding the performance analysis you mentioned in a comment, read http://www.brendangregg.com/bpf-performance-tools-book.html
There is also a new version of Gregg’s Systems Performance book coming out soon.
I’m looking forward to reading the BPF book, but I’ve not seen any announcements about the new edition of Systems Performance other than the statement at the end of http://www.brendangregg.com/sysperfbook.html. Do you have any more information?
He mentioned at the end of his LISA 2019 presentation to keep an eye out, but I don’t have any information beyond that.