Digital certificates

I want to be able to communicate between two PCs in my home. The instructions (Apply for a digital certificate for your primary email address) seem to imply this is necessary even for home-home connections. Is it really necessary, and, if not, what other authentification can be used to set it all up please?

You can use password authentication, or only when you click on accept also.

Thanks, Ronny. I will try it all out tomorrow. I just want to be able to access my desktop upstairs from the laptop downstairs and EVPNseems to offer much more than just a wireless connection.