True as you say for beginners it is better to invest in the top altcoins because the risks we face are lighter and easier for us to predict, then in the top 10 coinmarketcap is the right choice but you also have to look at the potential of the coin to make it easier to make a profit.
The point is to make a profit that is not easy at all even though beginners choose coins or tokens that are in the top 10 coinmarketcap, because the investment name still has the same risk even though the losses will not be the same.