I'm curious at what age people think it's appropriate to teach junior players how to defend / attack from set pieces and corners.

There's nothing specific in the National Curriculum that I can see. The focus seems to be on skill development up to the U13s and then more game development from U14s up.

I coach an U13s team and up to now have preferred to focus on developing their technical skills - particularly because half my team should be playing in the U12s and even U11s.

We've done some work on our shape on the field, making sure our back four move up, down and across as a group and the team go wide or compact depending on the stage of play.

Should I work more on set pieces, or continue to focus on developing their core skills?