Newbies should embrace the DCA method as if their  life depends on it. It should be their watch word, they shouldn't deviate from it. When you say they should be careful with DCA I don't really understand what you are driving at. As a newbie who is making your first investment in bitcoin, I expect your first buy to be in lump sum or possibly an aggressive buy in order to have a reasonable amount of bitcoin in your portfolio. Once this is done and the newbie is not satisfied with the level of his portfolio, he should embrace the DCA with all his heart and follow it. There is nothing to be careful about with DCA, as this method was carefully designed to give everyone a soft landing.  Also as a newbie you have no business with portfolio diversification, your primary target should be bitcoin. Don't go any any shit coins in the name of diversification and get yourself hurt at the end of the day. I won't deny that there are room for diversification, but this can only come in when you have spent a reasonable amount of years in your crypto journey and have better understanding of the market, but as a newbie this is not for you.
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No one learns anything from the mother's womb. Circumstances and personal ambitions make him interested in the outside world. No one comes into a profession fully learned, one has to gradually acquire skills. One thing needs to be mentioned here if anyone can buy a fish from the market then understand when will gone and which better.

In exactly the same way how to buying and how to holding about cripto currancy there need not have no special knowledge.Only you have to know which board and what do you have to do. you have to know also how to secured his own wallet.