The most common youth football mistake is teaching the exciting thing before the safe thing. Kids want to hit. Coaches want to run plays. Nobody wants to spend three weeks on stance, footwork, and head placement.
But every technique that keeps a player safe depends on a body position they have to own before contact speed goes up. If a player cannot maintain a base at walking speed, they will not find one in traffic.
The progression is stance, then movement, then leverage, then contact at controlled speed, then contact in space, then position-specific application. Each stage gates the next. A player who cannot demonstrate the earlier stage does not advance, and that is not a punishment — it is the whole system working.
Parents deserve to understand this too. A parent who knows why their kid spent a week on footwork stops asking when the real football starts.