Comprehensively looking at trading, we all know it's a risk even to those that might have even gotten the knowledge on crypto trading. As a trader you are proned to experience gain and loss no matter how smart you may be, but the bottom line of becoming a trader is the ability to reduce loss and maximize profit.
I 100% agree with your advice to newbies, because investment is more profit oriented that trading, though it takes longer time.
When I started crypto as a newbie, I dived into crypto trading without adequate knowledge, at first it seemed easy because I was trading on spot and margin, and I was making some gains until the unfaithful day that market turned me down.
I had to close all trading account and fully go and learn about crypto trading, how to read candles and all necessary information before I reopened those accounts because I made a very huge loss.
So as a newbie, it is most safer to invest than to trade.
Though it gave me an experience that's very useful to my trading life.