Checkboxes and conditional formatting We really only need two built-in features of Google Sheets to make this work. First, we need checkboxes to add a check mark to tasks that have been completed.

Learn how to add a single checkbox or multiple checkboxes in Google Sheets using the Insert menu or Data Validation rule the right way.

The strikethrough and checklist functions in Google Docs can be particularly handy when organizing tasks online. Here are keyboard shortcuts for them.