'Topics In Algebra' by I.N.Herstein. Back in college years this was my first book. Despite many other books (which might look easier) I always came back here be

'Topics In Algebra' by I.N.Herstein. Back in college years this was my first book. Despite many other books (which might look easier) I always came back here because of the care it takes to walk through well crafted progression of concepts. (Not a 'computer science' book but you will need something like this for the Algebra part)