A quick introduction to the topic of Field Theory with some Examples.
Group Theory video
https://youtu.be/bExDFCRM7Mo
Field and Galois Theory by Dr. Patrick Morandi
https://www.amazon.com/Field-Galois-Theory-Graduate-Mathematics/dp/0387947531/ref=mp_s_a_1_1?ie=UTF8&qid=1538265015&sr=8-1&pi=AC_SX236_SY340_FMwebp_QL65&keywords=field+and+galois+theory+morandi&dpPl=1&dpID=41PHVG4O3RL&ref=plSrch
