Onto

 Onto

####Used to say that someone or something moves to a position on a surface, area, or object

e.g. She watched him walk onto the platform.

e.g. Pour the syrup on to the egg mixture.

####Used to say that a room, door, or window faces towards something or allows movement into another place

e.g. The dining room looks out onto a pretty garden.

e.g. a gate leading on to a broad track

Sources:

Cambridge dictionary

Longman dictionary

Oxford dictionary