If we explain by giving an example; The US Dow Jones (US30) index is composed of the weighted average of the top 30 industrial sectors. Numbers written near the country indexes indicate how many shares are in the index. There are also sectoral indices within the stock market indexes. .
If we look at world indices; The NASDAQ Index (USTEC) is the American Index, which includes the top 100 non-financial technology companies listed on the Nasdaq stock exchange. Another difference of this index from other indices is that it includes companies that are not American corporations. Organizations must be listed with a volume of 200,000 shares in the Nasdaq stock market for at least two years to be included in the indexes, but not in any business case.
When trading in the world stock market indexes, you should follow all the information about the world economy, the economic and political developments of the country where the index belongs, the state of the stocks in the stock market indices and the indices.
In particular, it should be noted that the decisions of the Federal Reserve. Federal Reserve (FED) and the European Central Bank (ECB) are very influential on the world stock market index values.