You may display the charts in bars where all price action information for that period is displayed in just 1 bar.
For example for 5 minute charts, every bar on the chart represents 5 minute period for that trading session.
The price at the top of the bar represents the high at that 5 minute period.
The price at the bottom  of the bar represents the low at that 5 minute period.
The small horizontal line (-) at the left of the bar, represents the open price at that 5 minute period.
The small horizontal line (-) at the right of the bar, represents the close price at that 5 minute period.
Similarly if you switch the chart to 1 minute, every bar represents  the price action for that 1 minute period with the high, low, open and  close prices.  This is the same for all currency pairs.
Also if you switch the chart to 1 hour, every bar represents the  price action for that 1 hour period with the high, low, open and close  prices.  This is the same for all currency pairs.
Last but not least if you switch the chart to 1 day, every bar  represents the price action for that 1 day period with the high, low,  open and close prices.  This is the same for all currency pairs.
So which time frame to use?  It depends on your trading style.    Being a scalper you will definitely use 1, 5 or 15minute charts.  Being a  intraday trader, you will probably use 1 hr, 4hr and 1 day (yes to   draw trend lines), and for day traders you will definitely use 1 day or  more time frames.
Bar Colours
If the session for the period closes higher than the open, normally in most trading platforms is shown in green, because the price for that period went up.
If the session for the period closes higher than the open, normally in most trading platforms is shown in green, because the price for that period went up.
If the session for the period closes lower than the open, normally in  most trading platforms is shown in red, because the price for that  period went down
If the session for the period both the open price and the close price  are equal, it indicates that the price did not went up or down for that  period and it shows indecision during that period.  .
Now let’s examine candlesticks which is another way of analysing charts and price action.
 
