Google Docs provides an interactive checkbox feature that allows users to mark tasks as completed in to-do lists, making it easier to visualize progress and stay organized. To insert a checkbox, users can type two square brackets [] followed by space, or use the Format menu or toolbar to access additional formatting options. The checkboxes can be turned into checklists by adding items after each checkbox, and they can also be assigned as Google Tasks for added functionality. Additionally, Google Docs integrates with other apps through Zapier, allowing users to automate tasks and workflows.