@Justin can provide a great video for people who already use RW. But there are a couple of other vides that should really help.
Keep in mind that WP was a theme-driven blog, then theme-driven website tool. Only relatively lately (last 5-6 years) have products akin to Foundation, Foundry, et al. come out for WP. Elementor Pro is to WP, as Foundation/Foundry/etc. is to RW. It takes you beyond the basic theme-based approach and project builders give you a lot more freedom.
One video to definitely look at is this one:
Translation: How to Use RW without a Theme. i.e. all our page builders.
After that first one, another great one to view (also by WPTuts) is this:
I look forward to Justin’s tutorial also, but these should also help. I think both pretty much assume you are familiar with WP in general. That said I think they are both clear and helpful.