Take the Music Mastering Quiz 1 & 2 (10 questions each). I hope they help you dispel some myths about mastering, give some tips on how to prepare your mixes for mastering, and learn the differences between custom mastering and online mastering (mastering algorithms or mastering robots). I've sprinkled some music production and mixing tips throughout that might help you improve fidelity in your mixes and get your music ready for mastering.
Got a question or suggestion about the quiz? I'd love to hear it!
And remember--There is often more than one right answer! So have fun!