In Russian, the words "на" and "в" help us describe where things are. But we use them in different ways.

1. Use "в" (which means in or at) when talking about:

   • Closed places:
     • For example: в комнате (in the room) or в магазине (at the store).
   • Cities and countries:
     • For example: в Москве (in Moscow) or в России (in Russia).

2. Use "на" (which means on or at) when talking about:

   • Open places or surfaces:
     • For example: на улице (on the street) or на футбольном поле (on the football field).
   • Islands and events:
     • For example: на Карибах (in the Caribbean) or на концерте (at the concert).

If you remember these simple rules, it will be much easier to choose the right word!