It says:
Throw out your fears, biases and predjudices then read that again..
"The right of the people to keep and bear arms shall not be infringed."
It isn't difficult at all to understand the Second Amendment. Its words were chosen very carefully in order that every person could understand it. It was written to prevent the government from infringing in any way, shape, or form upon the Natural Right of the law abiding citizen to keep and bear arms and to use those arms to protect himself and others from anyone who would do him harm.
It was expected that the law abiding citizen would do whatever was necessary to prevent the right being infringed. It was understood that The Second protects all other rights. It was assumed that no citizen who loved liberty would be willing to give up any of their Natural Rights.
It is difficult, near impossible, to understand any law abiding citizen or group of citizens who would allow anyone to put restrictions or limitations upon any of their God given rights. Period.
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Stay safe.
It does not limit whom one may defend oneself against. It does not limit what arms may be used in defense of oneself or others. It does not limit the locations where one may defend oneself. It does not limit where one can go armed. It does not limit the time of day when one may defend oneself. It does not say that "reasonable" limitations or restrictions may be placed on the right of the law abiding citizen to keep and bear arms.