Welcome dmcnabb,
1. Look at the Documentation sub-folder for PDF documents:
(c:\Program Files\Graphisoft\ArchiCAD 14\Documentation\)....the Reference Guide has over 1300 pages
Also, Tom Simmons' Step by Step book was very helpful. It is a few versions back but again on the whole the core concepts are there. http://www.cadgarage.com/nestbysttrgu.html