I started studying Profinite Groups a few weeks ago. I'm using the book "Profinite Groups" by Wilson as a basis, but the book is not clear enough sometimes (probably because I'm studying it for the first time). Classify a book as good or bad is subjective, so I would just like book-recommendations for me to analyze.
This document provides a real good and short introduction. It has been written by Hendrik Lenstra (now emeritus professor at the Univ. of Leiden, Netherlands).