Once a region is selected, you can use the //set [block] command to fill it with specific materials.
WorldEdit allows you to manipulate thousands of blocks simultaneously, performing tasks that would otherwise take hours:
WorldEdit is compatible with a variety of platforms and versions: Minecraft Building Tutorial: World Edit Basics!
Using items like sticks or shovels as "brushes," you can paint shapes like spheres or cylinders directly into the world.
One of the most critical commands is //undo , which allows you to reverse accidental changes immediately. Installation and Compatibility