I love all of the instructional videos that are now available online. At this point, there are probably very few trades where you couldn’t get a decent starter education in the subject just by studying videos (and other materials) at trade association websites, online trade mags, and YouTube channels.
The Copper Development Association is producing an excellent video series called Do It Proper With Copper which illustrates proper techniques for joining and using copper in different architectural and plumbing apps. Dig those giant 8lb “soldering coppers” (irons) in the above “Copper Sheet Fabrication” video (which, as the vid points out, actually only weigh four pounds — they’re rated in pairs). [Thanks, Dale!]