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.
Many traders, when they started their activities in the cryptocurrency market, faced various problems and, first of all, with the advice and training of people who instilled confidence that cryptocurrency trading is an easy activity and the main thing is to sell at a higher price and buy cheaper. But if you adhere only to this understanding, then collapse and loss are inevitable, since the trader must first of all have the knowledge to analyze the chart of the coin in order to choose the best time to complete transactions, and you also need to set a goal and clearly adhere to the plan using a specific strategy. Of course, my words are still fairly unfounded, because I do not have much experience, but nevertheless, I begin to understand this process and what is the great danger. Im just starting to use the strategy of scaling to master this strategy fully, Before I start working in other directions.