AutoCorrect will automatically take some of the most commonly mispelled words you make, and the moment you hit your spacebar it'll look back at the word and automatically fix it. Now if it's not working for you it might not be turned on, or you may need to customize AutoCorrect to automatically correct a word for you. To turn on or customize AutoCorrect first click the Office Logo button, go to Word Options and click on the category Proofing, and then find and click on the button AutoCorrect Options. A window will then pop up for you and you'll want to click on the AutoCorrect Tab and make sure the most if not all the options are checked. Here you can add or remove words as well.

Purchase the training video and you can see this in action for yourself!