Did you know you can slide across the keyboard to type words, rather than tapping individual letters?
Swipe briskly from letter to letter and the words will appear as if by magic.
This feature speeds things up, but relies heavily on autocorrect. In recognition of this, the delete key removes entire words when using Slide-to-Type.
If you find yourself accidentally triggering the swipe controls, these features can be disabled in Settings: go to General > Keyboards to toggle off Slide to Type and Delete Slide-to-Type by Word.