Learning-design should be an independent subject, embedded into other subjects

• For some knowledge that we learned in school, we might not use later; 
• However, one-type of knowledge that we use daily and life-long is knowledge-of-learning-design (or call it knowledge of how to learn) 

So the earlier, more explicitly, more systematically that we can learn about it, it is better

This subject should be taught in school, both as an independent subject, and embedded into other subjects

Spiral curriculum of learning-design should be developed, so that learners can develop their knowledge-of-learning-design as they grow up, and as they learn more and more about other subjects.