Instead of trying to stop these newbies not to go on trading because of their lack of experience and skills, my advice is, let them trade and experience on their own how risky trading is, that way, they will learn trading the hard way. And for sure, the next time they trade, they will prepare for it to avoid further losses.
In reality, no matter how we discourage newbies not to rush in trading, the more they will force themselves to try trading, until they will start trading on their own and realize that there’s no easy trading, everything is actually tough and risky.
But if you are just starting, start with small funds and try first trading with popular coins such as btc. Grasp how to execute a trade, learn some techniques while doing it. And learn from it so you can use it the next time around. Each trade is a learning experience so to speak. And not every trade is the same but the process is the same.