When I was learning rails, I had to look in many different locations to figure out how to do some basic things like logging and other debugging tasks.
I have done a short update to the debug section of the top level README to introduce people more completely to the options they have on debugging rails.
It is not information overload, but makes the process a bit clearer and also explains how to add your own log message from a controller.
It also points out that Ruby on Rails is based on Ruby and for new people to go look at the two online Ruby books to learn more about the language they are trying to debug themselves.
