Home recording and audio engineering in general really wouldn’t mean much without a good final product to listen to. As much as the tried-and-true rules and methods can be a great start, knowing when to break the rules and start experimenting can improve your tracks. If all of the guides you read say your mics should be placed just so, but you get great results with a better placement, go for it! Nobody will know that your mics were in the “wrong” places, but you might see your skill progression stunted without a little experimentation.
You can read more here: http://www.audio-issues.com/recording-tips/advanced-microphone-techniques/