Firstly, this demonstrative pronouns use for indicate one thing from some many. In engliush, article "the" and "that, this" pronouns usually take on this function in an affirmative sentence and "what/which/whom" in an interrogative sentence.
- Сегодня я был в обувном магазине.
- Today i was in shoe store.
- В котором?
- In which?
- Который на улице Ноградской.
- That is on the Nogradskaya street.
At second, you should distinguish pronouns "который" and "какой": the first indicate one thing from some many, the second describes some characteristic.
- Которые туфли?
- Which shoes?
- Третьи справа.
- Third from the right.
- Какие туфли?
- What shoes?
- Кожаные, белые.
- Leather white.
Pronoun "который" changes like adjective by the number: singular, plural; by genders (in the singular): musculine, feminine, neutral; and by cases (as plural, as singular, in all genders). It give 3x5+1 (neutral gender changes by cases like musculine, but in nominative other ending, also there are 6 cases, but in accusative case ending like in nominative or genitive) = 16 forms of the pronoun.
It should be noted: there is one quesion: "Который час?" that translates "What time is it?"/"What o'clock is it?", the answer doesn't contain the words "который" anyway.