Good question.
What would you teach?
Well for the fact part I would teach restraint, just copy what you see. Obtaining facts is a very passive thing, most of the effort in obtaining facts is in keeping your free will cool, and not let any choices of yours change the facts.
For the opinion apart I would teach that there are many ways that you can choose. Like democracy and dictatorships are vastly different ways for a country to choose, there are also different ways an individual can choose.
You can choose to believe in God, but you can also choose not to believe in God, and you can also choose not to choose on the issue.
But I think one should mainly focus on love and hate in explaining. For instance that if you call somebody hateful, then that opinion says as much about who you are as being the owner of your decisions, as it does about the person you are calling hateful. That is because you choose the conclusion hateful yourself, you express your own emotions, in saying somebody is hateful, and the term hateful is about somebody else as being the owner of their decisions.
etc. etc. a simple course, which should have demonstrable enormous benefit. Academic achievement should go up at least 10 percent whatever, the emotional atmosphere markedly improved also, or if not then really I am wrong about it.
But I would not have it taught in public schools, but only in religious schools. That is because people have an addiction to making what is good, loving and beautiful into a factual issue, they get a kick out of it. And no way can you deal with that addiction in the setting of a public school, the students will have the teacher for lunch for messing with their kicks.