Text labels should be placed horizontally on the chart so that they are easy to read.

Text labels should not:

- Be rotated
- Stacked vertically

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A labeled axis, or multiple axes, indicates the scale and scope of the data displayed.
 - For example, line charts display a range of values along both horizontal and vertical labelled axes.

Labelled Axis or Multiple Axes 

Label usage should reflect the most important data insights in a chart. Axis labels should be used as needed, and in consistent ways across a UI. Their presence should not inhibit reading the chart.

Axis labels

Bar charts should start at a baseline (the starting value on the y-axis) of zero.
Starting at a baseline that isn’t zero can cause the data to be perceived incorrectly.

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