My laptop keeps typing the "]" key by itself and making ding dong sounds. I can't type anything with out it typing this symbol in the middle of it and making ding dong sounds. What is wrong with it? What can I do? Please help! Thank You

Some possibilities:

The "]" key is stuck due to dirt, food, dried liquid, etc. Try exercising the key or blowing the keyboard out with a can of compressed air designed for electronics.
Keyboard is defective.