title_body: How to convert tagged articles into a single ebook without losing tags for reading on kindle?
upvoted_answer: Probably the best approach for this would be to treat each category as a chapter. The whole point of chapters in a book is to control the order in which a reader proceeds through the book. It sounds like you want to ensure that each category is read in a specific order, so your next step would be to decide just what that order should be. 
  
  If you still want to make use of any tags, then you will want to convert those to html anchor tags, which will also be used for each category (chapter). When all is finished, you could have a full Table of Contents (your list of categories), as well as a directory of tags. This will probably require some additional work in converting the content and getting it formatted properly, but it is definitely doable. 
  
  If you decide you would like to tackle this on your own, I strongly recommend using Guido Henkel's guide to formatting. It's a nine-step process that takes you through very detailed instructions on how to create a properly formatted e-book, including how to create a Table of Contents. He will also explain the free tools you will need, such as Notepad++ and Calibre. I used this to create my first e-book four years ago, and it is still the same process I use now, with nearly forty titles published. 
  
  This guide can be used by anyone, but it would be a lot easier if you already have a basic understanding of html. It isn't required though, because he does an excellent job of explaining everything and taking you through the process step-by step. If you find this to be too daunting, then your best approach would be to find someone to format it for you.