Prepositions к, по

  1. You would use the preposition k in Russian with verbs of 'going' to indicate going to a person's place. The person to whose place you are going, or whom you are going to see will be in the dative case:
    Я иду к Антону.
    I am going to Anton's.
    Они идут к учительнице.
    They are going to the teacher's place (to see the teacher).

  2. The preposition по will always require a noun in the dative case:
    Туристы ходили по улице.
    The tourists were walking along the street.
    По телевизору идёт интересная передача.
    There is an interesting program on television.