I'm coming from the Garmin 430 and G3000 systems, and wanted to learn about the layout and menus and button-pressing on the G3X Touch. Did a little searching and found this Garmin cache of videos:

https://www.garmin.com/en-US/learning-center/g3x-touch

(Tip for John Hodges and the TacAero folks: consider sending this link to new owners to help get them up to speed prior to delivery!)

-Dane