Essentially title case means to capitalize every word except articles (a, an, the), coordinating conjunctions (and, or, but, …), and (short) prepositions (in, on, for, up, …). This is trickier than it seems because many words can be used in different grammatical functions. For example, in Lay It All on Me, “on” is a preposition and must be lowercased, but it is used as an adjective in It’s On Again and as an adverb in I Could Go On Singing, so it must be capitalized in both cases.