Minecraft command3?

Ti
1

Does anyone know minecraft on the phone? So I play minecraft on the phone 1.11.4. And I wanted to ask if anyone knows about commands. I only know how to adjust time. Teleports. Weather makes. But I recently saw on YouTube that somehow you can set walls with an ax. And you can also give on the phone commands and barrier blocks if so how? Actually, because I only know how to set walls. And if you can give yourself commands and barrier. And if you can delete an area the blocks. If that goes on the phone how do I do that?

za

Put with the ax blocks, that must have been worlddedit.

https://mcpedl.com/worldedit-pe/

The command for the ax is // wand