"I looked for this kind of information on their site some time ago and couldn't find it as organized and to the level of detail I needed (intermediate) and couldn't find it. I ended diving into source code, figured out some things, but couldn't get anywhere useful and I abandoned the project. Starting for your link, in 5 minutes I found the exact class and methods I was looking for." - SeattleGaucho
the power of documentation is amazing.