How to plot a single OHLC bar
 
 As already mentioned, its made up of open/high/low/close price of a given security.

A long straight line stands for the high and low where high is the highest point of that line and low is the lowest point of the line, which effectively defines the trading range

The open price is denoted by a tick on the left hand side and the clos price is denoted by a tick at the right hand side of the long straight line., viz the trading range


How to plot a single candle stick bar 

Candlesticks are usually composed of the body (black or white), and an upper and a lower shadow: the area between the open and the close is called the real body, price excursions above and below the real body are called shadows or wick. The wick illustrates the highest and lowest traded prices of a security during the time interval represented. The body illustrates the opening and closing trades. If the security closed higher than it opened, the body is white or unfilled, with the opening price at the bottom of the body and the closing price at the top. If the security closed lower than it opened, the body is black, with the opening price at the top and the closing price at the bottom. A candlestick need not have either a body or a wick.
To better highlight price movements, modern candlestick charts (especially those displayed digitally) often replace the black or white of the candlestick body with colors such as red (for a lower closing) and blue or green (for a higher closing).