Before photographing local people, you should definitely ask them for permission. Remember you cannot make shots of women dressed in black capes.
When you enter a home or a mosque, you should definitely take your shoes off. You should be very careful while selecting clothes before visiting religious sites of Istanbul. Short skirts, shorts and open tops are not suitable for observations of the city.
You can drink alcohol in specially designated areas only.
Tips in local cafes and restaurants make up about 10% of the total amount of the order. Leaving tips in taxi is not common.
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