This part of Hamblin's chapter on Aristotle gives an overview of Aristotle's account of fallacies and a discussion of its context. In the remainder of the chapter, he will consider particular fallacies.
As you read the chapter, you should of course, think about the overview that Hamblin provides, but the really crucial part of Hamblin's treatment is what he says about the context of Aristotle's theory. So pay special attention to the sort of debate Hamblin describes and think about the degree to which and ways in which is like the contexts in which you encounter fallacies. In short, ask yourself how relevant Aristotle's account is today. If you think it's relevance is limited, think how it might be altered to make it more relevant.