The Notes app on the iPhone and iPad is a surprisingly useful, multi-functional tool. Whether you want to manage a project, set yourself weekly goals, or create a grocery list you won’t forget at home, it’s easy and efficient. You can add links, insert photos, include sketches, create checkable to-do lists, collaborate with others on a shared note, lock your notes for extra privacy, and more. You can see all our Notes app how-tos here. But first, let's get started with the most basic function of the Notes app: creating to-do lists.