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.
You should capitalize Colosseum when referring to the specific ancient Roman amphitheater in Rome.
Yes, you should capitalize "The Rotunda" as it is a specific place or location.
You should capitalize "Musical Theatre" when referencing the specific genre or art form.
Yes, it is correct to capitalize "Should" if it is used in a title as it is a noun in this context.
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.