where

Used in questions to ask about a place or a position.

• Excuse me, where is the nearest bank?
  Affedersiniz, en yakın banka nerede?
• Where are you going on holiday this year?
  Bu yıl tatile nereye gidiyorsun?

Used to ask about a situation or a stage in a process.

• Where did I go wrong with this recipe?
  Bu tarifte nerede hata yaptım?
• Where are we with the project at the moment?
  Projede şu an hangi aşamadayız?

Used after verbs such as know, ask or tell to talk about a place.

• I don't know where he went.
  Nereye gittiğini bilmiyorum.
• Can you tell me where the station is?
  İstasyonun nerede olduğunu söyler misiniz?

Used after a noun to say which place you mean.

• This is the house where I was born.
  Burası doğduğum ev.
• Do you know a café where we can sit outside?
  Dışarıda oturabileceğimiz bir kafe biliyor musun?

Used after words such as situation, case or point.

• We've reached the point where we need help.
  Yardıma ihtiyacımız olan noktaya geldik.
• There are cases where the rule doesn't apply.
  Kuralın geçerli olmadığı durumlar var.