Text snippets are one of the most useful “unknown” features on Mac and iOS. They let you type a few letters, and have them expand into a whole word, sentence or paragraph. You can use them to type, say, aadd and have it turn into your office address, for example. Or you might set up a shortcut to generate a symbol usually hidden on the iOS keyboard: xx to type a #, for example.
Until now, though, Apple’s Text Replacement function proved a royal pain to use. It never synced properly between devices, and it didn’t support multiple-line snippets. But in an update last week, Apple fixed both those problems.