Introduction
Altium Designer is a suite of Electronic Design Automation (EDA) tools including Schematic Capture, 2D/3D PCB Layout, Design Verification, Component Library Management, and much more.
All hardware at Midnight Sun is designed using Altium, it is a very complex piece of software and we will only scratch the surface here. For more detailed documentation, go to http://techdocs.altium.com/display/ADOH/Altium+Designer.
Here are some resources to get started:
Schematic Symbol/Footprint Creation
Design Rule Checking (DRC)
Linking Solidworks and Altium