How would I make a collision system for build system

How would make a collision system for roblox (I have a placement system with grid already.).

Once a block its placed you can place another block inside it which I don’t want.

I tried looking around and didn’t find way.

(P.s this my first post so idk how it works really)

Id create a smaller representation of your placeable and use :GetTouchingParts() to find any part colliding that shouldn’t. If it is, then prevent that player from placing!

(Roblox is whiney, and probably wants you to use this instead)

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