Magic wiht Paint Bucket Tool in Photoshop

Here is some quick tricks how to use paint bucket tool for remove the back ground and fill the
back ground without adding new layer.
open an image in adobe photoshop. unlock background layer. double on background layer
a dialogue  box,ll open click yes

Now pick the paint bucket tool and to the properties bar ( at the top of canvas) andchange
the mode of fill normal to clear .......

click on the area you want to clear

after few clicks, result,ll be