Download Algebra: Abstract and Concrete.
This book is being offered free of charge to anyone interested in learning abstract algebra.
The book provides a thorough introduction to "modern'' or "abstract'' algebra at a level suitable for upper-level undergraduates and beginning graduate students. The book addresses the conventional topics: groups, rings, fields, and linear algebra, with symmetry as a unifying theme.
Some recommended books:
P.M. Cohn, Basic Algebra
P.M.Cohn, Further Algebra and Applications
The Princeton Companion to Mathematics
Symmetry and the Monster: The Story of One of the Greatest Quests of Mathematics
A River Runs Through It and Other Stories, by Norman Maclean.