And unless they're at the start of a sentence, as with 'Friends' here, they don't need capital letters. The other types of nouns here are proper nouns. And these do need capital letters ...

Watch: When do you use capital letters? Watch this video to learn about when you should use capital letters in your writing. Here are some rules when to use capital letters. Every sentence should ...

Using capital letters in your signature generally suggests a healthy level of self-esteem. When you write your name entirely in capital letters or simply begin with one, you convey that you value ...