Article: You can set reminders for any note or list no matter where you sign into Google Keep. It's at the top of the note on the mobile app, and at the bottom on the web app. Depending on the nature of your reminder, you may also want to select a location. This adds a reminder to your note.  Depending on your settings, you may also be prompted to allow Google Keep to send you notifications and/or access your calendar app. You can edit the reminder at any time by tapping it at the bottom of the note or list.

What is a summary?
Tap a note or list in Google Keep. Tap the bell icon. Select a date and time for a reminder. Tap the Back  icon to save (mobile only).