Go to your game menu and press "Open to LAN". Next, it will show your IP address. Write down the IP address, and go back to the title screen and click on.
Inside that world, press the Esc key, and click Open to LAN. Choose a game mode to set for the other players. Tip: Survival is the default Minecraft mode.
Select the “Open to LAN” button, customize multiplayer options, then lastly select “Start LAN World” in the lower left corner, and a 5-digit LAN number will.
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.