Headlines and Titles of Works

Q. Should “that” be capitalized in titles? Does it depend on usage? Take, for example, this title: “Features of the Website That Are Offered as Premium.” Thanks!

A. The word that is always capitalized in a title. That’s because that’s never a preposition, and though it can function as a conjunction—for example, when it introduces a subordinate clause (e.g., “Tell Me That You Mean It”)—it isn’t one of the seven common coordinating conjunctions (and, but, or, nor, for, so, yet). In your example, “That” is a relative pronoun.

For more details and examples, see CMOS 8.159 and 8.160.