VPN on Mac from Windows 10

I recently set up a VPN Server on an old Windows 10 PC, but I don’t know how to connect to it with a Mac or iPhone. Can anybody help me?

What kind of VPN did you create? Windows VPN? OpenVPN?
Both of them are not natively supported by default (Windows does not normally speak IPSec) nor does the iPhone speak OpenVPN.
So: additional information needed

I suggest you to go for an OpenVPN. Most VPNs are paid. If you’re not willing to pay, then install Tunnelblick, that’s what I use. Feel free to message me if you want to know more details.

I don’t know, I followed these instructions: https://pureinfotech.com/setup-vpn-server-windows-10/

Well that tutorial is using PPTP connections. I would not recommend using that. Buy a used raspberry pi and use the install script from Nyr.