Apple Watch offers a standalone Reminders app, and as you'll soon learn, it can be just as functional as the iPhone app.
The introduction of an official Reminders app on Apple Watch was great because this little app on your wrist will help you get through all your errands throughout the day and keep track of your busy life.
The app is used with Siri since there is no keyboard to input text on the Apple Watch like there is on your iPhone. With that being said, using the Reminders app may feel a little awkward at first, but it should become a second nature to you in no time at all.