I am interested on infinite group theory. Well, I found many references, but all of them consider any particular structure: abelian groups, finitely generated groups, topological groups (particularly profinite groups), Lie groups, ...
Do you know some references treating infinite groups in general? Thank you.
I can recommend the two volumes of Derek Robinson Finiteness Conditions and Generalized Soluble Groups (Part 1 and Part 2) which are probably discontinued, but possibly available in a math library near you. They are an excellent source to start with. Part 2/Contents I found on-line in .pdf format. Note that a lot of research on finite groups has been inspiring the research on infinite groups. That is why certain classes or even varieties of groups are studied. To this end also the book of Hanna Neumann Varieties of Groups makes an interesting read.