what is the community's most/least valued rule in the giver?

I believe the most values rule would be that of nakedness. Desire isn't allowed, thus, the only evident nakedness would be that of the very young or very old. They believed that nakedness would promote emotion, and emotions, like desire, were not allowed.

Im my opinion, the least important rule would be the rule against lying, as we see lies being told everywhere. The fact that people lied to him, especially his parents, was a real eye opener for Jonas. He just couldn't fathom that his parents would lie.