Here is a page of information related to prepositions (sometimes called postpositions in Hindi because they come after the noun): http://www.ispeakhindi.com/wiki/index.php?title=Postpositions

There are a number of ISpeakHindi.com episodes/lessons that are linked to from the bottom of the page.

This part of the site is a ”wiki” which allows anyone to add and update the information. If there is something about Prepositions/Postpositions that you learned that you think will be helpful to others, then you can just click ”edit” and add it.