If you double click the Home button you can scroll over to the right and lock your screen orientation in landscape or portrait. You can also see active apps and touch and hold them to turn them off, access the volume controls, and use Air Play from this menu.
If you don’t want to be disturbed, you can go to Settings and toggle Do Not Disturb on and incoming call, notifications and messages won’t bother you. They’ll still be collected, but your iPhone won’t make a sound or light up.
Go to Settings > General > Keyboard > Shortcuts and you can set up your own personal shortcuts for typing messages. You can also add loads of emoticons to your text messages by going to Settings > General > Keyboard > Keyboard and selecting Emoji.