Knowing how to use and configure autocorrect on your Mac will make it much less annoying.
0:00 Introduction
0:10 Accepting word and phrase predictions
0:26 Ignoring word and phrase predictions
0:38 Accepting a spelling suggestion
0:48 Choosing a spelling suggestion for a flagged word
1:04 Ignoring spelling suggestions
1:19 Undoing a spelling correction
1:29 Ignoring a misspelled word for an entire document
1:45 Teaching Autocorrect new words
2:30 How to remove a word from the Autocorrect dictionary
2:45 How to turn off all or some aspects of Autocorrect