This article explains how to add a secondary axis to a chart in Excel so you can view unlike categories on the same graph. These instructions work in Excel in Microsoft 365, Excel 2021, Excel 2019, ...

The X-axis, which is the horizontal axis, on most Excel charts does not use numeric intervals like the vertical Y-axis does. The X-axis contains either strings of text or a date under each set of data ...

Excel has two primary types of charts that graph data sets onto an axis: line charts and scatter charts. Depending on your settings, the two types of charts can look identical, but using the wrong one ...