# Chapter 9: Adding the Create, Update, and Delete Operations to our API In the previous 2 chapters, we implemented most of the functionalities for our Bookstore API. In this chapter, we'll be finishing off the last 3 endpoints related to the book listings. Since we've already had plenty of practice, there will be less explanations on guidelines and best practices, we'll jump straight to the point when planning and implementing our endpoints. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://book.restfulnode.com/part-3/chapter-9.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.