Minecraft add friends?

I wanted to play Minecraft with a friend the other day, but then it occurred to me that I didn't even know how to do it. I've read that you need some kind of code to do this, but I don't know where to get it.

Do you play Java or bedrock edition?

In Minecraft you have to rent a server for this.

You can do that here, for example:

https://www.g-portal.com/

https://server.nitrado.net/deu/gameserver-mieten

Java or Bedrock Edition?

Java

Java Edition

If you are in the same Wi-Fi network, one of you can start a single player world and open it in the pause menu in the LAN. Then the other can enter this world via multiplayer.

If you are not in the same Wi-Fi network, you need a server or a realm. Some servers are free, but then the server's performance won't be as good. You can rent a good server for a fee or create one for free on ploudos.com or aternos.org.