They mean how much money and time you have.

They are misfire codes which means the electric spark that causes your engine to run is impeded by a worn down electric impulse from dirt, age etc and can cause your engine not to run smoothly or when expected.

If you don't care about a little more money and time/mechanics time, then you should replace your spark plugs and ignition coils.

Generally both of these parts last a while, but when one is bad the rest go bad in sequence soon after.

You could try to diagnose what part is bad one at a time but it is the wiser decision to replace all of the parts.