This is quite useful chart indeed.
This is just applying to my case only. I started Appsheet back in 2017. I believe the materials are still available on Youtube, but I attended to weekly webinar at that point of time to learn the platform. My case was also not to learn from the sample apps, but I started to build my own app from scratch. Then when I faced the problems and need to find a tricks to achieve the functions i need, I visited documentation and knowledge base first and search Youtube Appsheet with other keyword to find a tricks.
Then added new knowledge to me.
Even after 3 + years with Appsheet, new idea, tricks are added mostly every day. That will NOT make me bored.
FYG, I m Appsheet partner, so basically Appsheet is my business tool.