What are some sonnets for this?

Does that chapter 4 talk about some of the different types or "forms" of sonnets? For example, does it discuss the differences between a Shakespearean (or English) and a Petrarchan (or Italian) sonnet? The easiest way to distinguish between those two types of sonnets is by their different rhyme schemes. There are subtler differences in the way those two types of sonnets use the poem's 14 lines, but don't worry about those at first. Start by identifying their distinctive rhyme schemes. Once you can spot a Shakespearean or Petrarchan sonnet by its rhyme scheme, you'll probably be able to revisit chapter 4 and read it with greater understanding.