There are a bunch of different charts that can be created, including bar charts, line charts, area charts (line charts that fill the area between the line and the axis), pie charts, or scatter charts (XY charts where one value is plotted against the other). Each kind of chart has an equivalent class, for example PieChart or LineChart.

Each one, at the same time, can have different types. For example, the default type for BarChart is column, printing the bars vertically, but they can also be printed in vertical, selecting a different type:

>>> chart.type = 'bar'

Check the openpyxl documentation to see all available combinations.

Instead of extracting the x axis labels from the data, they can be set explicitly with set_categories. For example, compare step 4 with the following code:

data = Reference(sheet, min_row=2, max_row=4, min_col=2, max_col=2)
labels = Reference(sheet, min_row=2, max_row=4, min_col=1, max_col=1)
chart.add_data(data, from_rows=False, titles_from_data=False)
chart.set_categories(labels)

The range, instead of using a Reference object, can also be input with text labels describing the region:

chart.add_data('Sheet!B2:B4', from_rows=False, titles_from_data=False)
chart.set_categories('Sheet!A2:A4')

This way of describing it may be more difficult to deal with if the range of data needs to be created programatically.

The full openpyxl documentation can be found here:

https://openpyxl.readthedocs.io/en/stable/index.html.