How to see things through ViewportFrame

How to use ViewportFrame, how would I see the image of an object on a gui

Try looking at the api-reference ViewportFrame | Roblox Creator Documentation it might help

ik but how to use it to see an item

so basically it is like a virtual workspace you can parent parts into it and it will render out, first of all you need a camera object to actually render the parts, then you can Parent parts in the Frame and it will show up in the frame

do you know any yt tutorials that show this?

First create Viewport. Position the viewport Correctly on the screen.

Once this is done you need to put the object you would like to see inside the Viewport. You can do this with a script by cloning the object then setting it’s parent to the viewport.

Now we create a camera and set the CurrentCamera of the Viewport to this
Then we set the CFrame of the Camera to a position which can view the object