Note: In light of recent events, I am going to spend time backtracking my Twitter timeline and attempt to document some memorable moment. Apologies if these may be repetitive to you.
I highly recommend High Performance Browser Networking by Ilya Grigorik. Great overview and insights whether or not you are new or a veteran.
The book is from 2003 however. Thankfully, Ilya provided a “15 sec 2nd edition” when I asked on Twitter.