In this guide, you will learn how to NoClip Furniture in Roblox Work At a Pizza Place. It means that you can place an item inside another one without any collision.
As you can see in the image below, the chair cannot be placed on the dance floor because the dance floor is one block high.
The first thing you need to do is find another house.
Go inside the house and then you can go out. After that, do not go into your house.
Select the item you want to place before going into your house. Once you have selected the item, you can go inside the home.
After that, you can place the item without any collision.
Let’s do this again; you can glitch into someone’s house because all houses are closed.
But must remember to select the item before going into the home. 
Now, you can place a chair inside.