Headlines and Titles of Works

Q. My professor has requested that one of our assignments have the titles of tables in headline-style capitalization. What does this mean?

A. Headline style capitalizes the important words in a title: Six Reasons Susan Buys Shoes. In sentence-style capping, only the first word and proper nouns are capped: Six reasons Susan buys shoes.

[This answer relies on the 17th edition of CMOS (2017) unless otherwise noted.]