The best way to start in Sverchok is to start by using some of the Generators nodes provided by Sverchok. For example, some of my favourites are: SV Line, SV Circle, and SV Grid. But there are plenty for you to try.
Shift+A is the Hotkey I often use to quickly search and find the node by name. Ctrl+Space inside node tree to get a nicer categorized list of nodes. You can also find some node macros.
Generators node usually requires Viewer Node or Viewer BMesh in order to generate a usable preview or to generate real Object in Blender 3D View.
It is up to you how you want to explore Sverchok, whether you want to work in Object ID level or more in deep components level.
The most interesting part of Sverchok for me is how it handles List of List and Array. You will soon understand data in this format [[]] and [[[],[],[]]].