Capitalize the first word of a quoted sentence.
"Look! This is an example!" Joe said.
Lucy said, "Duh. You said that already."
Capitalize a proper noun.
A proper is used to denote a particular person, place, or thing. It is a noun that usually does not have a "the" or "a/an" in front of it. (You would not talk about this state as "The Michigan")
The Landmark Inn
I love talking about the time that I went on vacation to that place that I love.
Capitalize a person's title when it precedes his/her name; however, do not capitalize when the title is acting as a description following the name.
Doctor House is always right.
House, a doctor of medicine, knows it is never lupus.