Charts are used to represent data in a way that is easy to identify trends and patterns, make comparisons, or track metrics over time. They help in the process of analyzing and answering questions that come from a dataset.
In general, avoid using charts to represent more than 5 values. For that, it's better to use the table component. It is also recommended to use the same color when representing the same metric for different categories.
The best way to choose a chart type is to first understand the intent of the visualization. Data should always be displayed in an accurate manner to avoid misrepresentation or misleading conclusions.