Use the Insert > Chart menu in Google Docs to isnert a chart. You can choose a variety of chart types: Bar, Column, Line, and Pie. The chart will appear with sample data and you can edit the chart's data in the connected Google Sheet. If you want a graph in your report, proposal, or research paper, you can create one directly in Google Docs.

In Google Docs, go to Insert > Chart > From Sheets. In the pop-up that appears, select the spreadsheet and chart to use. If you don’t want the chart linked to the original spreadsheet, uncheck the Link to spreadsheet option when you’re inserting your chart. Click Import to add the chart to your document.