Some of my keys on my keyboard will not work. For example, if I type in an n it becomes like this n/. Also my zero button will not work. How should I fix this?

How do I fix

Fast answers:
1. Try resetting NVRAM/PRAM and SMC. Doesn't usually 'cure' keyboard problems you report, but it costs nothing and only takes a few minutes.
https://discussions.apple.com/thread/3819550?start=0&tstart=0
2. Try plugging in a USB keyboard. Doesn't absolutely have to be a Mac keyboard. A PC keyboard will work for a test. If the typing problem does not occur with the USB keyboard, you have a temporary solution until you can arrange to visit a repair facility.
3. If your MacBook is older and has a user-removable battery, shut down the computer, remove the battery, and examine it for signs of 'bulging' or swelling. Then connect the computer to the Magsafe power supply, without reinstalling the battery, and turn it back on. If the keyboard problem has gone away, it was likely caused by a swelling battery.

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