if i start a server on my computer. then what do i need for other people to join it. i know how to do it local
it’s practically impossible for us to know since we don’t know your network setup. Most likely you will have some sort of router installed and possibly a firewall. If you have a router installed you need to search for port forwarding and how to implement it on your router. Also if you have a firewall installed, you will need to modify the settings to allow external connections to your server instance host/port.