Analog pins always shows 0

Hello, I am learning with arduino and wanted to try analog pins. First i tried using my potenciometr and output showed only 0 so i thought i got faulty potenciometr, today i tried fotoresistor that i tested to be 100% sure that it works, and it works just fine but still output is always 0. I meassured voltage directly on arduino pins and it showed voltage that there should be. Did anyone have similar problem?