Add reminders for to-dos, projects, groceries, and anything else you want to keep track of. Use subtasks to organize your lists further—for example, organize your grocery list by supermarket aisle. Your new reminders and changes appear on all your Apple devices that you set up with the same accounts.
How to set reminders
Open the Reminders app
Select a reminder list in the sidebar
Click the Add (+) button in the top-right corner
Enter a title for the reminder.
Add a date, time, and location if applicable
You can repeat the reminder and mark it based on priority. When the reminder has been completed, select the blank circle on the left of the reminder.