Theme help

I am just beginning to get a very basic understanding of what is going on behind the scenes of my site.

When looking to get help – is it better to have a really widely used child theme?

I am using Genesis and a child theme from Viva Violette. Can Genesis users ask for help on this forum? Can Genesis users who use a non-studiopress child theme ask for help on the studio press forums?

If I want basic help with things like formatting – and I want to learn to do it myself – am I better off using a very widely used theme?

Many thanks

Kim