I recently bought a bicycle and am new to biking. So I decided to try it out on an inclined part of the road near my home. as I descended on the incline just after travelling a few metres I heard a clink sound from the chain system. Naturally I braked at once and decided to check but I could not find anything visibly wrong.
However as I headed back home to further check for something I noticed that whenever I move my rear wheel opposite to its usual direction of motion the pedals started to move opposite to their natural direction of rotation. How can I fix this?