The coaches will naturally understand the rules for their age groups and the kids will pick these up quickly and adapt to the changes as they move through the age groups.
This page isn't designed to be an exhaustive list of rules for each and every age group, but more to help with some of the step changes we see.
One of the biggest steps is from U10s to U11s. Chiefly as for U11s, the offside rule is introduced. Please click here for an easy to follow, basic introduction to the Offside Rule in under 2 minutes on YouTube