Area chart: Displays the numerical size by area. Shows the trend of quantity change with time. Time series contrast relationship: this contrast relationship is the most common one, indicating the situation that changes with time. Common chart types are: line chart, area chart and vertical waterfall chart.

A good chart should conform to the "four good": easy to understand, good to look at, easy to make and easy to use.

1, easy to understand: easy to use, clear and accurate data expression.

2, good-looking: appropriate color matching, unified style.

3, easy to do: easy to make, easy to smear.

4, easy to use: speak to express opinions.