During my time studying IT I learned that there is just 1 way to learn how to code(at least for me) and it is "Writing Code". There was no prof who could teach me coding, but they showed me the baselines(how a OS works, what OOP is, what UML is and so on). But coding for real I learned because I was parttime working as a Developer for a company that gave me a chance and time. That's why I think you shouldnt teach coding in schools you should explain them how computers work, which technologies are involved and so on.