heading - Rules for capitalization in presentation titles

Hi everyone,

I am German and the German language follows very strict rules of capitalization: A word starts with an upper case letter if its a noun or at the beginning of a sentence. In the English language however, nouns are usually written with a lower case letter at the beginning.

But right now I am working on the slides for a presentation and I wonder what the rules for capitalization are in titles? I do have a template here and on that it looks like in titles all nouns are written with an upper case letter in front. Is this true? What is the general rule here?