Brace for heavy falls Tuesday as fresh gloom about China's economy spreads across global markets.
U.S. stock futures were sharply lower and international markets traded deep in the red.
Here are 4 tips for today's trading. This will help you decide where you should invest and what to look for:
1) China slows
Stock markets in China ended with more losses after new figures showed the world's second largest economy is losing steam. An official gauge of factory activity fell to a three-year low in August.
Concerns are mounting over the health of the Chinese economy -- which is now posting its weakest growth since the financial crisis -- and head of the International Monetary Fund, Christine Lagarde, warned Tuesday that developing countries should brace for the impact.