By setting up categories on your blog, you can save time when writing your ebook. Set up categories according to your main ideas and chapter headings in your ebook outline. Each time you post to your blog, put the post in the appropriate category. When you are ready to put your ebook together, simply pull up the category that corresponds to the chapter or section you are working on and you will have all of the content you have written in that area over a period of time. Categories not only save you time but also help you to organize your thoughts. Do some keyword research to help you choose the categories that your readers will be looking for in the search engines.