Go to the Multiplayer tab and make sure that Visible to LAN Players is enabled; Start the game. To join a LAN session: Click Play on the Minecraft title screen.
You need Ethernet connection. Then one created a World. Press Esc and then open to lan. If you are both connected to your Router vie the LAN cables the other.
1. Search for a server to play on. 2. Copy the server's IP address and note the version. 3. Open the Minecraft launcher. 4. Set your game to the correct version.