When writing by hand, underline the titles of long works. When writing on a computer, use italics. Long works include books, albums, movies, TV series, and works of art.
Book: To Kill a Mockingbird
TV Show: She-ra and the Princesses of Power
Art: Viva la Vida Watermelons
Remember to capitalize the first and last words in a title and all words in between except a, an, the, and, but, or, and short prepositions like in or of.