Charts are a set of visuals that share many common formatting elements. So it makes sense, I feel, to look at them together. This will help your understanding of the shared aspects of these charts and also makes it easier to comprehend the more complex JSON that is used in some of the more advanced charts.
Stacked bar chart
Stacked column chart
Clustered bar chart
Clustered column chart
Line chart
Area chart
This is quite a collection of visuals to learn about. Fortunately, ...