First person refers to the speaker (I, we), second person refers to the person being spoken to (you), and third person refers to someone or something being spoken about (he, she, they).
The speaker / writer (I, we) is the first person, the person addressed (you) is the second person, anything/anyone that is under discussion (he, she, it, they) is the third person. Example: I told you (created by the 1 st safety), that she (created by the 3 rd safety) would arrive.