Off the top of my head, being an apprentice with someone (certified electrician) who is wiring basements to finish them off is a great way to learn what is going on in a practical manner. Wiring all the outlets and lights in parallel on different circuits, figuring how many lights or receptacles on one circuit, wiring three way switches, switching out breakers, landing homeruns (power is completely shut off for all this).
And...you can get paid for something that you enjoy and you can get that great feeling of everything actually working when you flip that switch for the first time. Also great to have a skill to fall back on during tough recessions.
Don't forget the grunt work involved, drilling all the holes thru studs, floor joists and or rafters. Then pulling all the wire (rough in, need inspection) After inspection passes, then acutally connecting all the wires (finish, need another inspection) is the fun part:)