The Android operating system from Google is available for tablets and phones that are made by various hardware manufacturers.
Android for Beginners:
How to turn on and off the device.
What is your google account?
How to use the device?
What are apps and what kinds are available?
How to interact with the device and its apps.
What apps come with a phone or tablet, and how do you use them?
How to clean phone
How to reset phone