Most routers auto-select channels, but you can manually pick less crowded ones using your router's admin interface. Channels 1, 6, and 11 work best for 2.4 GHz.

A router will have LAN and WAN ports where you can plug in the cable from the modem or connect other devices. It typically has lights on it to let you know when the Wi-Fi is connected.

How does a VPN on your router work? You can set up a VPN client, not a server, on your router. You'll still need access to a VPN server.