Buying Low and Selling high is not bad at all, this is the simplest form of the explanations you've said. For example, you're teaching your kids math, you wouldn't teach them Calculus on the spot but you are going instead for the basic, which is 1 + 1 = 2, simple as that. Beginners can't adopt what professional traders do easily, they have to take step by step process on being a Trader they wanted to be.

Though what you have said was all true, I agree about that. On the other side of it, it would be more helpful if you're going to show some actual trading proofs (images) for them to easily understand your advice.