The best way to remember these is to associate 1st person with "I", 2nd with "you" and 3rd with "he, she, or it". So a story along the lines of "I went to the store" is using 1st person narrative, etc.
1st person is when it is from you. 2nd is when it is directed at people or someone, kind of like cookbook instructions, 3rd person is observing a person or thing.
