When you want to say "Good night" in Turkish, you can say, İyi geceler. Good night In some towns in Turkey, people like going out at the evening. When you go home, you can say this phrase.
When you want to say "Welcome" in Turkish, you can say, Hoş geldiniz Welcome. In Turkey, people will welcome you saying that in restaurants, shops, cafes. In return, you could say Hoş bulduk