Some useful Tips of iPhone users

Save power in a pinch

Use Low Power Mode when you need extra iPhone battery life. Go to Settings > Battery.

Take a screenshot

Press the Home and Sleep/Wake buttons at the same time. The picture is saved to the Screenshots album in Photos.

Add a webpage to iBooks

Find something worth keeping? In Safari, tap the share button, then tap iBooks to convert the current page to PDF and add it to your bookshelf.

More more tips with video tutorial check out https://tips.apple.com/en-us/ios/iphone