so that mean ıf ı want to say who is that in my room? bu odatakı adam kim? doğru?

Taki means: If u talking about the man in course, you say: kursTAKI adam. It indicate that where is man. So it means the person(or something) in that place. We use taki with fotograf because we talk about where is man(photo) We use this when we talk about something in a place (or like this)