New to System Development but have done minor module development

I am trying to see if there is a complete working model of a system that I could use a base to understand how to make a system. I mean I realize everyone is going to write solutions differently. All of the tutorials seem to be for before v10. Should I just follow those and modify where I need to for v10+. I am trying to develop a game system and It be nice to be able to create a foundry system for it to play test and develop it more. Any suggestion I would love some direction. I am pretty good at looking at code and breaking it down but I am really looking for a simple system just to understand the basics. I tried EZD6 which was the simplest system I could think.
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