I did a quick lookup and I think you are referring to this video
That’s an old(er) one, from 2015. Which was for Pinegrow v2, There is a lot changed since then! You can better follow and watch the more recent Wordpress Tutorials, to get a better understanding how things are working now in the current v5 interface and learn also about the “Smart Actions”.
And there is a lot of Wordpress information in the documentation.