@Scott Williams
Nodes are quite new environment with which you can create, well, pretty much anything. It offers node based programming paradigm as Xpresso does but is buy far more capable. Not only is capable of logic, it has tools for flow control, structures etc. Check the basics here on yt channel
https://www.youtube.com/@CORE4D
Also, there is node file pit present here where you can get a good idea of what they are capable of
https://www.core4d.com/ipb/forums/topic/117017-scene-nodes-capsules-file-pit/#comments