What To Capitalize In Titles

Question

I understand that you are supposed to capitalize the first letter, as well as “main” words. What I don’t quite get is what am I supposed to not capitalize. Especially, verbs and prepositions.

To? In? Through? Except? Are? Is? Into?

In: 15

Answer 1

Or prioritise readability – and your readers – and don’t capitalise anything but the first word.