Can VPN go through NAT?

Can VPN server be behind a router?

I was wondering if a VPN server can behind a router. Basically, I want to create a VPN server on my computer and then access it from the internet using my phone. If I connect my phone to the internet using my computer's WiFi, how can I know if the VPN server is working properly? If the VPN server is not working, what happens? If the VPN server is working, I can use my phone to access the VPN server and then go online using my phone, right? Thank you in advance. The VPN server should be running on the same machine as your router. You'll have to run a static IP address on your router so it doesn't change from time to time.

Once the VPN server is running, it will need a public IP address which can be either on your router, or on your own computer. Then the VPN client can make connections to this public IP address, so that all of the traffic you send and receive will be "tunneled" through the VPN tunnel. When you are done with your VPN session, the client will disconnect. When it disconnects, the router will get rid of the public IP address and reallocate it to another computer.

What is the difference between OpenVPN routed and NAT?

OpenVPN Routed: The OpenVPN server creates a VPN tunnel to the clients.

Every client connected to the VPN will be assigned an IP address inside the private network of the VPN server.

NAT: Every client inside the private network is assigned an external IP address from the internet. The NAT device does not make sure that the clients are inside the private network, so the private network is not isolated. The public IP address is accessible for clients outside the private network.