Ask HN: If you were asked to design Mathematics courses

Hello Everyone!

Say, you were asked to design Mathematics courses for children aged 5 to 18. How would you design the courses? What would you include in these courses at each year?

I am also interested in hearing from participants on this forum who think that they are not mathematically inclined or have a fear for mathematics; it will be fantastic information to understand how you will design the courses so that it is made more accessible to all.

Thank you!