What kind of movement requires the preposition onto?

Use onto when talking about movement onto a surface.

For example, a phrase like this: The train left as I stepped onto the platform.
Solidify this grammar point right now
(you will be asked to create an account if you do not have one)

Learn more simple rules

Phrase the Cat inviting to practise English Phrase the Cat waving

At PhraseCat.com you can study grammar points and practise their application right away.