Russian has two words for “here” in the sense of location “at here”: тут and здесь. They mean exactly the same thing; the only difference is that тут has a more conversational tone, so if you are writing a formal essay, stick to здесь. Sample sentences:

One mistake English speakers make in Russian is to use these words when trying to say “Come here,” and they produce something like «Приходи здесь». The sentence is completely awful in Russian. The first problem is that здесь/тут can only be used to mean location “at” a place, not motion “to” a place. The second problem is that if you are talking to someone in person, then they have already arrived, so приходить/прийти “to arrive/come” just doesn't make sense. The right way to say it is «Иди сюда». We'll discuss сюда in the next few days.