Title case is a style that is traditionally used for the titles of books, movies, songs, plays, and other works. In title case, all major words are capitalized, while minor words are lowercased. A simple example would be Lord of the Flies.
What is a title case heading?
In title case, every word in a sentence except for titles of works, conjunctions and (short) prepositions are capitalized.
Should I use title case in headings?
For example, if you are writing an article for Medium, then using title case for the headline is preferred. If the organization you are writing for uses AP style, this means that your headlines should be in sentence case. In AP style, title case is only used for composition titles.