Futures charts hold a wealth of information that investors can use to improve their trading. Prices rise and fall in response to changing supply and demand, and understanding how chart indicators respond to these price movements can mean the difference between a profit and a loss.
If you can spot bearish or bullish candlesticks, then you're well on your way to knowing how to read futures charts. If you see a few greens in a row then the price is going up and if you see a few red then the price is going down. Different candlestick patterns can indicate different things happening to the market.
However, futures aren't always a reliable indicator of which way stocks will actually move. They represent more of a bet that a stock or index will move in a particular direction. Sometimes traders will accurately predict the direction, but sometimes they won't.