I open 2 pictures that I have saved in at outside folder.. how can i get them on the same "canvas" to overlap each other etc.??
Dont need bullshit answers such as "do tutorials" so dont bother.

2 separate images on the same canvas?
Select the image you want and CTRL+C and then go into the image you want it pasted into and then CTRL+V, usually works for me then you can re-arrange layers etc.

this, or just open 1 image, then go to File -> Place and select the other one

Bump

select the move tool and drag one from the first image into the next image, it will appear on a new layer over the first image.

Just copy / paste ? Or open both in seperate canvases and just drag one image to the other canvas