WHO AND WHOM ARE USED FOR PEOPLE

The girl who lives next door, has got a puppy.

My geography teacher is a woman whom I like a lot.

Whose is also for people.

​It can substitute possessive pronouns or nouns.

Which is only for things:
The car which is parked there is my friend´s.

That is for people and things:
-The letter that Carl sent me was very silly.
- The girl that I saw yesterday is not nice.

That is the house where I used to live with my parents.

​Read the example:

​WHERE GIVES MORE INFO ABOUT A PLACE.

AND WHEN DO WE USE WHERE?