User blog comment:Lavamelon/New policies/@comment-24055022-20170511230901/@comment-29650585-20170511235516

There's is a big difference. Take a look at this. In a sentence case title, the first letter of a word is capitalized only if it's capitalized in a normal sentence. However, for media titles, every first letter of a "big" word is capitalized. So it's still "How to Train Your Dragon" rather than "How to train your dragon."