Google have made a few improvements to help you highlight important data in your spreadsheet charts. In Google Sheets on the web, the improvements mean you can:
Choose different shapes for data points in both line and scatter graphs:
Click on a data point to open the pop-up toolbar.
Simply click on the Point Style item from the toolbar, and select the size and shape you require for the data points of your chart.
Label data to display more exact values for a chart’s bars or points:
Select the Data Label item from the pop-up toolbar:
Data labels will be automatically positioned on your chart: