The takeaway is to think about your data and whether the chart you are using makes sense for your data. Don’t blindly follow rules. Times series are not always best shown using line charts or ...

If you understand the definition of a mathematical function, a good way to judge it is that any line drawn parallel to the y-axis intersects with the values in the function’s curve only once ...

Bar charts and line graphs can be combined. Climate graphs are an example of this. The x-axis shows the months of the year and there are two y-axes to show average temperature and total rainfall.