Preposition: on

• topic: Learn about after-death communications, how to find a reputable medium, book reviews on related topics, and inspirational messages.

Adjective modifier

• many: She is author of over sixty academic articles, about forty book contributions, and many book reviews.

Modifies a noun

• staff: You can also contact the book review staff directly.

• section: Although featured in the book review section I feel this plug is relevant to this section.