"КАКОЙ" или "КОТОРЫЙ" (what-which)?

Some students asked me to explain the difference between these words in Russian and to give some examples with “который”.
I’ve written a lesson about these words today. The students who are studying Russdian can find it via the Link:

If you don’t understand some details or if you have some more querstions about Russdian, you can ask me here or on my wall.
Good luck with Russian!