Yesterday I finished Introduction to Gatsby, a beginners course by Jason Lengstorf, hosted by Frontend Masters.
But it can also load dynamic data because it also is a fully fledged React app.
The Gatsby team just released a big feature: Gatsby Themes.
Gatsby Themes are similar to Wordpress plugins. They are pre-configured and you can load them into your Gatsby configuration.
Here is a free Egghead.io course:
And you should also take a look at Jason Lengstorf's Youtube Channel: