The power to make Amendments?

It's important because times, as well as people's attitudes, change. Adding Ammendments is a way to deal with those changes.

How they pertain to me -- I can vote because of the 19th amendment. Although casting a vote that doesn't count isn't very valuable, but that's another topic (Electoral College.)

No matter where you go in the world, there is always someone taking advantage of some right, law, rule, person, whatever. Jerks abound.

The first ten amendments are the Bills of Rights. Yes, I think they are a necessary part of the constitution.

First Amendment – Establishment Clause, Free Exercise Clause; freedom of speech, of the press, Freedom of Religion, and of assembly; right to petition,

Second Amendment – Militia (United States), Sovereign state, Right to keep and bear arms.

Third Amendment – Protection from quartering of troops.

Fourth Amendment – Protection from unreasonable search and seizure.

Fifth Amendment – due process, double jeopardy, self-incrimination, eminent domain.

Sixth Amendment – Trial by jury and rights of the accused; Confrontation Clause, speedy trial, public trial, right to counsel

Seventh Amendment – Civil trial by jury.

Eighth Amendment – Prohibition of excessive bail and cruel and unusual punishment.

Ninth Amendment – Protection of rights not specifically enumerated in the Bill of Rights.

Tenth Amendment – Powers of States and people.

The powers not delegated to the United States by the Constitution, nor prohibited by it to the States, are reserved to the States respectively, or to the people.