I must admit, this one went by in a blur. First section was on describing groups, and introduced the idea of a group presentation. Second section was "conjugates, centralisers and centres", presenting some new concepts, followed by "groups of small order" which described how to work out what smaller groups were isomorphic to. The whole chapter ended with "finite p-groups" which discussed groups that were direct products of other groups of prime power order. This leads neatly to the next section which seems to be almost entirely be talking about groups of prime power order.