For people that want to learn "physical engineering", I recommend the same thing I do when people ask people the best way to learn software engineering: you nee

For people that want to learn "physical engineering", I recommend the same thing I do when people ask people the best way to learn software engineering: you need a project. Find something in your life that you want to automate, and automate it. Motivation is easier to maintain ("I still want this problem fixed") and you'll learn so much more from failure and iteration than you will following someone else's tutorial about "how to build X".