Are there online tutorials for Microsoft Bookings?
Are there videos available on how to use Microsoft Bookings?
There are a number of online text and video guides on how to setup and use Microsoft Bookings.
Microsoft's support site has a setp-by-step guide to setting up and using Bookings
Linkedin Learning has a complete video training course on how to use Bookings with clearly defined chapters that allow you do jump around to only the parts you want to learn.