United States - Basics

Here is a list of some helpful divisional documents to help you learn more about flying and controlling in US airspace:

Document Description
Phraseology Guide Detailed Phreaseology Guide for every ATC positions - IFR + VFR
Basics General Procedures that are applied at any location.
Clearence Delivery Handbook Erverything about the Clearance Delivery - for US, Canada and Bahamas.
Ground Handbook Erverything about the Ground Control - for US, Canada and Bahamas