If you don't have deep knowledge about some terms in the English language, you might not really understand what they mean. For instance, a first and third-person are pronouns that are used when constructing sentences to describe some set of characters. First-person pronouns are pronouns that are used by writers and authors to refer to themselves as they are putting down their point of view about a particular matter or issue. Examples of first-person pronouns are I, Me, Myself, Ourselves, Us, Ours, etc.
Third-person pronouns, on the other hand, are the set of pronouns that can be used to refer to someone or an object other than the speaker, writer, or listener. Examples of third-person pronouns are he, his, him, himself, it, itself, its, herself, her, she, they, them, theirs, etc. As a writer, it is not always easy to get different points of view about something because you're limited to your own idea. However, things become easier for a writer if he's making a particular narration using a third-person pronoun.