Here is a really good book for Wireshark: https://www.amazon.com/dp/1593272669/_encoding=UTF8?coliid=I11HBIRF55QCWX&colid=1QE51EOZ8AY1G
/r/Wireshark has some helpful posts either on the side or if you sort by top/all.
Wireshark can be intimidating at first with all the I information you get but if you follow some guides you will do good.
I would recommend Practical Packet Analysis by Chris Sanders. It is a bit non-theoretical, IMO. If you are unsure about purchasing this book, I suggest you look at the PDF version over here. This PDF is not completely legal as it's a pirated version but to have some ideas about the book, you can read it here.