Above / On

Above – means at a higher place than something.

Onmeans supported by the surface of something.

EXAMPLES of correct sentences are .

His office is right  above our office.

His office is  on the second floor.

The plane is flying  above the clouds.

Our plane is still  on the ground.

This bird always flies  above our building.

This bird always sits  on that pole.

I want to hang that painting  above that shelf.

I left the hammer  on the shelf top  by mistake.