iPod touch User Guide for iOS 10.3
This book can be downloaded and read in iBooks on your Mac or iOS device.
Here's everything you need to know about iPod touch, in a handy digital format. Get to know iPod touch and discover all the amazing things it can do, and how to do them. It's the definitive guide for getting the most from your new iPod touch, straight from Apple. The iPod touch User Guide is an essential part of any iBooks library.
I refer to it when I am stumped and my intuition fails me.
Installer iOS update
I love it