No
Yes, you should capitalize "About" in a title.
"I forgot to do my homework. I know I should do extra homework so I can learn how to punctuate and capitalize a sentence."
Yes, you should capitalize the C in Century.
No, you should not. You should only capitalize a word when it is at the start of a sentence or when it is a proper noun.
Yes, you should capitalize "The Rotunda" as it is a specific place or location.
You should capitalize Colosseum when referring to the specific ancient Roman amphitheater in Rome.
Yes, it is correct to capitalize "Should" if it is used in a title as it is a noun in this context.
You should capitalize "Musical Theatre" when referencing the specific genre or art form.
It should not be capitalized.
no
No
No, but you should capitalize American. If the specific branch of the military is named, it should be capitalized.