I also put up an FAQ on this forum:
There is also now a lot of information in the Tech Docs that you can see at Home (totallyinformation.github.io) (for the current live version) or locally from whatever version you have installed in Node-RED.
Note that I'm working again on the vNext branch on GitHub and if you are just starting out, this should be the best version to start with.
There is also a dedicated forum tag: Latest node-red-contrib-uibuilder topics - Node-RED Forum (nodered.org). You can even subscribe to that so that you are notified of new posts.
