The US Constitution's structure consists of a Preamble, seven articles, and twenty-seventh amendments:
The Preamble, consisting of a brief statement, introduces the goal of the Constitution and the six purposes of the government.
The seven articles are based on fundamental principles like the Separation of Power, Checks, and Balances, Federalism and Popular Sovereignty. They outline the structure and function of the government, define the relationship between the states and the government, as well as the relationship between states, establishes how the Constitution can be amended and ratified and determines that the US Constitution and all laws made from it are the supreme Law of the Land.
Lastly, the 27th Amendments consists of the first ten amendments to the Constitution, also known as the Bill of Rights, which put limitations on government power and protect individual liberties such as the right to express, to petition the government and to have a fair and impartial trial; and the others 17th Amendments which deals with a variety of issues, like suits against a a state, election of President and Vice-President, abolition of slavery, citizenship, due process, equal protection of the laws, voting rights, taxes, Presidential terms and others.