1) The document provides information about different types of writing samples, including problem-solution essays, persuasive writing, and compare and contrast essays.
2) It gives the key features and components of each type of writing through both descriptions and sample essays on topics like clearing sidewalks in winter, choosing the best park to visit, and comparing cheetahs and jaguars.
3) The samples are meant to illustrate how to establish a clear topic, support a position with reasons and examples, and highlight similarities and differences between two subjects in each respective type of writing.