While listening to a fireside chat by Ken Exner the GM of builder tools at Amazon, he was taking about bringing his teams up to speed. While there does exist some basic, standard training classes, Ken mentions a better way. The best way to teach is to do and review.

Give a person an assignment. Have them do the work and then review with them. Experts ensure the learning and the company way by spending the time reviewing and teaching. The teams do the work, not the architecture or security experts.

– Ken Exner GM of builder tools at Amazon
Amazon Tools Talk