Open Lunar Client
Launch Minecraft from Lunar Client
Go to Singleplayer
Create or select the world you want to host
Open the world to LAN
Set the game mode and cheats if needed
Click Start LAN World
Share your local network details with others on the same Wi-Fi
Have others join through Multiplayer if they can detect the LAN world
If you want others to join from outside your network, use a separate hosting method such as a dedicated server or a third-party hosting service