My approach to learning a new technology (or-relearning something that changed several times since I last spend time with it) is writing documentation. As I wanted to write a small Sling application using the newly released Apache Sling 1.0, I decided to create a one-page documentation of the Script-resolution process in Sling. This is the frontside of my cheat sheet. It shows you how to get from HTTP request to content node, from content node to resource type, from resource type to script and what scripting variables are available.
On the flipside of the cheat sheet I documented all the hidden, but powerful request parameters you can use when dealing with the SlingPostServlet, the default handler for all POST requests that gives you endless options for creating, modifying, deleting, copying and moving nodes in your repository.
Click on the thumbnails to get a high-resolution PDF version of either side (3,7 and 1,7 MB) or download the PDF version (300 KB) here.
I hope it will help me a lot to understand S&JR more.