This part of the TMWA book concentrates on explaining the principles of the technologies used. This part is parallel to the slim walkthrough (or classic walkthrough), which guides you through creating your own application. Generally, the articles here can be read in any order, although if you are new to programming, you should probably start from the beginning.
This part is accompanied with presentation slides used during our lectures. If you want to get a quick overview, you can start with these slides, because they link to the longer articles where applicable.