I understand the caution you're advising for traders, especially newcomers. Trading indeed involves risks, and it's essential to have a solid understanding of market dynamics, technical and fundamental analysis. Your emphasis on starting with buy-and-hold strategies for beginners is wise, as it allows them to learn without the intensity of active trading.
This strategy is basically investing and not proper trading. In trading you need to actively buy and sell the assets. But when it comes to investing, then you have to buy and hold the coin for long term until and unless you make the desired profit from it. So if anyone wants to sharpen their trading skill, then doing demo tradings with dummy balance can really help them. Yes if you don’t know how to trade properly, then definitely you will lose the money. So it’s always better to acquire theoretical knowledge and then do the actual task.