You should read the essay “Ur-fascism” by Umberto Eco. It’s an 8 or 9 page PDF, and it does a really good job explaining fascism (including it’s seemingly inability to be defined - which to them is a feature).
This should be a PDF of it so you don’t even need to Google. Everyone should read this
If you’ve ever heard of the 14 defining features of fascism, they come from this essay. And he does an excellent job explaining them all and relating them to his life growing up in fascist Italy.