I have some example dashboards that I have created that are simplified as compared to most others in that they are a single file. I was always intimidated by the ADF and needing to have many many files for a simple dashboard.
I would recommend the ReadMe and seeing the examples here: https://github.com/jgstew/bigfix-content/tree/master/dashboards
And I have Dashboard Labs here: https://github.com/jgstew/jgstew.github.io/blob/master/_posts/2018-10-29-Debug-Dashboard-In-BigFix-Console.md