German knows a variety of pronominal adverbs. Pronominal adverbs are something a bit strange, because they play the role of a pronoun or substitute a noun or an idea. The translation into English is mostly a preposition and 'it'. In German to a word like da, wo, hier is added a preposition (at, against, to etc.). The history of this creation might be interesting to a linguist, but however for learning German it's just to be learned.