A pie chart is a circular statistical graphic often used in business showing percentages of types of customers, percentages of revenue from different products, and profit from a different department in an organization.
First step; get data into power bi click on the get data ribbon on the power bi workspace get data from either online or from your local file then load.
The second step; drag the pie chart from the visualization panel into the workspace
Third step: go to your field and click on the variables you want to see in your pie chart.
NOTE: when using a pie chart don’t use more than 5 slices, in fact, 3 slices are the best fit for this kind of visual