Sometimes, you need to illustrate a process to help communicate how it works. Diagrams and flowcharts do just that, breaking down information in a logical sequence.
To create flowcharts and diagrams in Google Drawings:
From Google Drive go to New/Google Drawings
Select the Shape Icon and click on a shape. Drag the mouse to insert that shape and resize.
That's it, you have the basics of creating diagrams and flowcharts in Google Drawings!
Bonus! Go to Google Templates to find lots of flowchart and diagram templates to get you started.