You travel farther , but pursue a topic further . Fewer versus Less. See Less versus Fewer . An ugly, jargony word. First, Second, Third.
Most guides prefer just plain old first, second, third , and so forth, without the -ly ending.
Grammarians have divided references to people into three categories, to refer to I , you , and he or she . The first person is I, me, my, we, our, and so on. The second person is you and your. The third person is he, she, they, their, his, hers, him, her, and so on. While you need to pay close attention to these when you study a foreign language, most issues of person are instinctive to native English speakers.