To-do lists are essentially a way to keep track of what you've already accomplished. You can create a functional to-do list in Google Sheets by following these steps: 1. Determine how many steps or tasks need to be completed. 2. Using the previous number as a guide, select the appropriate number of cells on the first column. 3. To create interactive checkboxes in Google Sheets, follow the instructions above. 4. Type the steps or tasks in order to the right of each checkbox. Toggle the appropriate checkbox for each completed step or task.