Some traders will never make it in trading whether we like it or not and this advice of yours should not be limited to newbies alone but for every trader, there is no reason to rush, patience is a virtue.
Many newbies don't know that crypto trading is hard, they think that it's a get rich quick scheme where they'll put in money and start getting returns immediately. Most of them learn the hard way after losing their funds due to impatience and not using the amount that they can afford to loose. It's after encountering loses that they'll see the need to first understand the fundamentals and technicalities of trading before entering it. The fact is that crypto trading is not for everybody, people who are not prepared to diligently learn how it works will be having far more loses than profits.