One of the strangest and marginally useful text editing tips on the Mac is to use the F5 key (fn+F5 depending on your keyboard preferences) to autocomplete a word. “Autocomplete” is sort of a misnomer, as it brings up a list of words that all start with the same letters you have typed so far. So it doesn’t really help your typing speed much, but it will help you spell words. And if, by chance, the letters you have typed can only match one word, it will, in fact, autocomplete.