I learned many techniques by watching videos, and then repeating the actions. Not sure if this is of any help, but there are some very in-depth tutorials on YouTube especially in regards to piping and framing structures. Otherwise, I would suggest a local community college or online college if you want to continue learning more. It is helpful to have someone around to bounce questions and ideas off of.
Another option that you could utilize would be an incubator at a local city around you. They usually offer classes and lessons on machinery and different programs.
Anyway, here is the link for YouTube, not sure if it is much help or not: