The first game is so important. The timing between the QB and his receivers. The cohesiveness of the o-line against competition who are not teammates. The audibles against a defense who does not know your plays. The defense swarming to the ball yet still maintaining responsibility of assignment. Clock management. Special teams. The Center/QB exchange. The butterflies that are as big as they will be in post season. I remember the season opener every season from JV through all four years at college. Forget the record or size of the opponent. This is foundation.