These articles are based on the 101 projects book:
https://www.pelicanparts.com/boxster/boxster_tech.htm The book is laid out well and the pictures are great. It covers what an owner with a basic set of tools and limited experience will want to get into.
The Bentley manual covers more in depth maintenance and is basically an abridged version of the factory service manual. It includes things such as detailed torque specifications and wiring diagrams that are not in the 101 projects book.