How can i get rid of crackling noise in my shoulder and knee?

The sounds in your joints are probably crepatis. It's a very common condition and it can start at an early age. It's usually due to "degenerative joint changes" ( I know the term doesn't sound good!). If you've ever had an injury to the joint or repetative stress- like from sports or training, your joints go through a set of changes that can cause the sounds. The time to do something is when you have pain or swelling or discoloration to the joint or a fever, unexplained sweating at night or recent fatigue. These are all signs that something bigger could be going on. A good sports medicine doctor might be a good consult if you're having any symptoms. Best of luck to you!