Cortana is a personal assistant feature introduced in Windows 10 that resembles apps on smartphones that reply to your voice requests for directions, a list of nearby restaurants, current weather conditions, and more.
One of the things Cortana can do, from either a voice command or text that you enter in her search box is setting appointments.
Click in Cortana’s search box to open Cortana and then click the Reminders button. (If you need an indication of which button is Reminders, just click the More button at the top of the Navigation bar). The Reminders panel opens.
Click the Add button (the + shaped button in the bottom right of the panel) and then in the resulting panel (see the figure) fill in the details of what you want to be reminded to do, including the date and time. When you click a field such as People, you might be taken to an app to make a choice. Click the Remind button.