Google Calendar: Staff - Scheduling Appointments with Google Calendar

It is a helpful feature in Google Calendar for setting up appointment schedules, similar to how Calendly works.

Here’s how to set up an appointment schedule:
Setting up an Appointment Schedule on Google Calendar

For a more detailed walkthrough, check out this article:
How to Use Google Calendar Appointment Slots

Share your availability from your email when someone asks. You can learn how to do that by reading this section: Bonus: How to Use the Google Calendar Scheduling Feature in Gmail.