Here's a breakdown:
1. When the quotation is a complete sentence:
* Capitalize the first word of the quotation if it's a complete sentence.
Example: She said, "The meeting is tomorrow."
2. When the quotation is part of a sentence:
* Don't capitalize the first word of the quotation if it's not a complete sentence.
Example: He asked, "what time is it?"
3. When the quotation is a title:
* Capitalize the first letter of every major word in the title.
Example: The book is called "The Hitchhiker's Guide to the Galaxy."
4. When the quotation is a direct quote from a person:
* Follow the original capitalization rules.
Example: The witness testified, "I saw the suspect running down the street."
5. When the quotation is part of a dialogue:
* Follow the original capitalization rules.
Example: "I'm going to the store," she said. "Do you need anything?"
In general, it's best to follow the original capitalization rules of the text you are quoting. If you are unsure, it's always a good idea to check a style guide such as the Chicago Manual of Style or the Associated Press Stylebook.