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Yes, there is. Tons of them. I'd recommend to find some textbook on networking as textbooks usually dose the information in acceptable amount and depth at a time and choose the right middle to start from (as there is probably no proper beginning to all this).
Some fields you've given as example (ip.flags, ip.ttl) are real packet fields, while others are generated by Wireshark (frame.marked). By the time you start understanding the basic real ones, you'll appreciate the usefulness of the generated ones.
I could offer you my "turbo-introduction to packet networks for dummies" slideshow, but it is in Russian :-(
