Libertarianism and facism are two different can of worms there’s no lines to connect here generally libertarianism is.more left wing but you can also get right-libertarianism as well while facism is completely alt-right smack dad right at the top
Libertarianism is essentially putting it as simply as I can is where a state or plot of land may split into little self governing microstates
And fascism is an established one party totalitarian state which has complete and utter control of there population might I add the complete and utter opersite of libertarianism. Your free to read the Wikipedia for both they’ll explain it better than I ever could