Apple Watch tips and tricks: Hidden secrets of watchOS

The Apple Watch is a complex device but it offers plenty to Apple iPhone users happy and keen to explore all its features. For the most part, you should be able to work out the basics of your new Apple Watch, but Apple has included plenty of hidden gems to allow you to get even more out of it than you thought possible. How do you turn on Power Reserve? How do you clear all your messages in one go? How do you take a screenshot on the Apple Watch?