You can see from the colour of a candlestick whether the price has gone up or down. Green bars indicate that the price has risen and red bars that the price has dropped.
A candlestick refers to the price development in a certain period. The period to which the bar relates depends on the period in which you are analysing the graph. For example, one candlestick can relate to an hour or a day.
The shadow of the candle indicates the price range within that period: this is also called the shadow of the candle. The body is the thick part of the candlestick and indicates the opening price and closing price of the period.

A positive green bar always opens in the lower part of the body and closes in the higher part of the body. A negative red bar always opens in the higher part of the body and closes in the lower part of the body.  To get more information visit #read candlesticks.