Expertise can't be taught. That's why you enter the workforce as a junior, whether you have an engineer's degree from MIT or you switched careers and are fresh out of a bootcamp. From there, the road to expertise is not paved with courses and books and hand-holding. It's paved with _lots_ of real world experiences, good and bad. Expertise _happened_ to those expert practitioners as it will happen to you as you fight fires, solve problems outside of your scope of responsibility, etc.