This is How to Teach Science
The Flowers Of Guidance Volume One Nine Instructive Steps to Gaining Knowledge Step 4: Light of knowledge
For this similar reason, when the goal is to train an engineer or a specialist, their instructors will initially teach them on the general and fundamental rules in their field, and they never begin with the details. When they adequately learn the general principles, then they will learn more specific details and become a specialist in the field. After learning the general information, they are going to join a company as an engineer, an intern, or a worker. They will gain experience along the way, becoming familiar with the details.