Wells Aluminum's web site has an aluminum primer listing the advantages of using aluminum, extrusion, case histories and design ideas. For a challenge, there is a Design Ideas puzzle where visitors to the site can guess what the extruded shapes are. Check the site out at www.wells-aluminum.com.
A make-your-own Star Wars Sith Lightsaber hilt is heftier and better-looking than most others out there, according to its maker, Sean Charlesworth. You can 3D print it from free source files, and there's even a hardware kit available -- not free -- so you can build one just in time for Halloween.
Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies.
You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived.
So if you can't attend live, attend at your convenience.