Here are the series of audio mastering software processors I've used on the over 30,000 songs I've mastered since 1999.  In this video, I use mostly izotope ozone plugins because it's easier to explain using them.  In real-life, I do mix in a few hardware pieces, and a waves plugin.

Don't spend 1-2 years (please never), 6 months, or even 6 weeks learning how to professionally master audio.  Not to mention waste a ton of money too.  Not when I can show you EVERYTHING you need to know in ONLY TWO HOURS with my Audio Mastering Secrets Video Series!