How to make players only place blocks in a certain place and not able to break them?

I'm trying to make a speedrun marketplace map thing where you have to cover a bedwars bed as fast as you can for a speedrun so I'm trying to make it so you can only place blocks in that area and not anywhere else. I also want to know how to make it so that you can only place blocks and not break blocks.

2

1 Answer

This is easily done by getting a Allow block like this:

/give @p allow

This Allow block will let you place block on it but no one can break it (except the owner and people with OP).