If the split in the lines have not confused you already, colors and patterns will probably do the trick.
Bi-Color, Black and Tan, Saddle or Blanket and what is the difference between a Sable, dark Sable and black Sable?
My friend Chris from Dogs for Defense K9’s has created some wonderful Color and Pattern charts (Thank You Chris 🙂 ) that will show you the difference between the colors and patterns. There is also a wonderful Website called Dog Coat Colour Genetics where you can get some in depth information on how pigment works. Especially the Agouti (Sable) Series is very interesting for us GSD owners.