The US100 Composite Index is a broad-based index of all the stocks listed on the US100 stock exchange. It is calculated by taking the weighted average of all the common stocks listed on the exchange, giving each issue an equal weighting. The value of this index changes daily based on market activity, and is seen as a good indicator of the overall performance of the US100 stock exchange. It is an important tool for any trader looking to keep track of the market and make informed decisions about their investments.

The best time to trade US100 is during the US market hours, which are 9:30am to 4:00pm Eastern Time (ET) Monday through Friday. This is when there is typically the most liquidity, meaning that it's easier to buy and sell stocks without facing large spreads or price jumps. Outside of these hours, trading volume tends to decrease significantly, making it harder to find buyers or sellers in a timely manner. To take advantage of the best liquidity and price movements in the market, plan your trades during US market hours.

The US100 and the US30 are two of the most well-known stock exchanges in the world. However, there are some major differences between them. The US100 is a computer-operated system that trades over 3,000 different stocks from various companies across all sectors. It also provides a real-time listing of prices for stocks, options and other securities.

On the other hand, the US30 Industrial Average (DJIA) is a stock index which tracks 30 of the biggest publicly traded companies in America. It only includes stocks from large industrial companies such as Boeing, Microsoft and UnitedHealth Group. In addition, it uses a weighted average of the stocks' prices to calculate its value, thus making it more volatile but also more representative of the stock market as a whole.