1. Dow Jones Industrial Average (DJIA): The Dow Jones Industrial Average is one of the most famous stock indexes in the United States. It is made up of the stocks of 30 large American companies, covering industries such as industry, science and technology, consumer goods, energy and finance. The Dow Jones index is usually regarded as an important indicator of the health of the US stock market and economy.

2. Standard & Poor's 500 Index (S&; P500): The Standard & Poor's 500 Index consists of 500 stocks of large American companies, representing the comprehensive performance of various industries in the United States. It is one of the most widely used indexes to measure the overall performance of the US stock market, and it is also an important benchmark for investors' portfolio performance.

3.NASDAQComposite: The Nasdaq Composite Index covers the stocks of all companies listed on Nasdaq, including companies in various industries such as technology, biotechnology and retail. Since many well-known technology giants such as Apple, Google and Amazon are listed on Nasdaq, the index is usually regarded as a representative of the performance of technology stocks.

The above three indexes are all important indicators of the US stock market, but they contain slightly different companies and industries. When paying attention to US stocks, we can refer to these three indexes at the same time, so as to have a more comprehensive understanding of the performance of the US stock market.