Why are the amendments to the US Constitution important?

The amendments to the U.S. Consitution are important because it explain our rights and duties as citizens. They are also important because you can defend using the first 10 amendment court for as an example. They are helpful also to strenghten the government and help people not to be control by other people like a queen or king. It gives people the independence also.

it was important to our ancestors because it ends the slaves and the differences between woman and man.

Not any more at least. The Supreme Court has negated the need for Constitutional Amendments by usurping the power to determine the MEANING of the Constitution. It is no longer necessary to amend the Constitution, when the Supreme Court can simply change the meaning of the Words therein by judicial Fiat.