I have made two cheat sheets, one showing all the functionality of the GUI and one describing the javascript that you can use in expressions. (Attached but I'll also print some copies.)
I've also attached a zip file of examples. To play with these or build off of them, you'll need to click Load in the Apparatus menu bar and then select one of the json files to load.
For reference, here are the videos I made last month,
The only major difference is that in the videos, spreads are created with javascript arrays. I decided I wanted a custom spread type, so to create spreads you now need to use the spread function. (See the javascript cheat sheet.)