Infinite group theory recommendations What is a good book to start a journey in the field of infinite group theory ? I have already taken a first course in algebra where we studied the most important (finite) algebraic structures and I'm taking the second course so I'm used to the basic tools of abstract algebra, however Infinite groups (except for $\mathbb{Z}$ of course) has only been cited as examples and never studied in details so I'd like a text to start the topic but that also focuses on it (without the "finite group theory" part). I'd like a book as general as possible but if I have to choose a particular kind of groups I guess Linear Groups are a good point to start (as I already encountered them in other courses).

I would like to stress my commentary in the sense of the kind of starting things that provoke those concepts that pervade the branch of infinite groups. For example we have:

If $G$ is a countable group then  it can be embedded in a group with two generators.

This theorem is from the 1970s and signals about the borning-techniques still in evolution on this huge branch.  
