We have a step-by-step tutorial for beginners as part of the doxygen documentation.

It will move over into this server at some point, but for now it's here.

The first few chapters have now moved:

1. Introduction
2. First Application
3. Basics
4. Node cores
5. Geometry
6. Light
7. Windows and Viewports
8. Traversal
9. Multithreading
10. Clustering
11. Modelling
12. Text
13. Find Memory leaks