The Gutenberg interface is very contextual. You’ll only see things at the moment you need something.
This can be a little disconcerting at first but once you work with Gutenberg over time you’ll understand that it’s designed that way to save space and keep you focused on a task you wish to complete.
In my video I focus on key elements that are unique to Gutenberg. I avoided showing things that you may already know such as saving the page as a draft (Gutenberg does that automagically) reviewing and publishing your page.