This chapter is from the book
Creating a Reminder Using Sticky Notes
You can create a sticky note that Cortana can use to create a reminder. Here’s how:

If you already have a note on the desktop, click the plus (+) sign to create a new note. Otherwise, open the Windows Ink Workspace and click/tap Sticky Notes.
Handwrite or type a note that includes a date or time.
The date or time portion of the note turns red. Click or tap the red text.
Click or tap Add Reminder. Click or log in if prompted.
After Cortana finishes recognizing text, make any edits needed.
Click or tap Remind.
Look for the confirmation message from Cortana.