This particular tip could lead newbies to making a wrong choice, diversifying your portfolio could be a good idea only if its being diversified amongst good and working projects, but now it's very difficult to get any good project or any valuable altcoin, only very few in the market are actually fulfilling the roles they were meant to.

The best choice for newbies is to invest in bitcoin, and if they want to diversify, they should only go for altcoins that are good and have been in the crypto market for a while now and are doing very well. Diversifying your funds amongst useless shitcoins doesn't reduce risk of losses, it does the actual opposite as it increases it.