I agree that good courses are a lot of help in understanding this ever growing and changing field. No one is going to understaand this without both hands on work experience and book training. The best book training is usually in the classroom. There are some good self study courses out there and there are some that are not worth spit.
That said, I still say there is no short cut to becoming a good electrician. You need both the electrical theory, safety basics AND hands on work experience.
Then once you finally get to be a journeyman then you still need to keep learning and appling your skills every day.
Please get into a study habit new things come out almost every day. Jobs in a varity of places occur every day.