This guide is, quite simply, everything I know about paid search.
It's everything I've learnt from years managing paid search campaigns agency-side, in-house and freelance.
As such, it's a pretty long guide. Go ahead and bookmark it now; you're unlikely to finish it in one sitting.
This article isn't going to improve your account's RoAS by 50%, double your volume, whiten your teeth, help you find singles near you, or any of the vacuous promises that most marketing guides make.
What this guide will give you, however, is very fundamental understanding of all the ingredients that go into a successful paid search strategy. It takes a foundational approach; it won't tell you a list of tricks to improve your account, but it will help you understand how to come up with those tricks yourself.