As a matter of fact, it's very unsafe to depend on a single coin. In otherwords, invest into more than one token by spreading your investment into potential coins but be careful not to invest into pump and dump coins. Above all, make sure to maintain risk management in which ever crypto asset you are investing in.
Investing in a bunch of altcoins as a form of risk management is a very dumb idea, the idea “don’t put all your eggs in one basket” doesn’t work the same way in crypto. Without proper research and understanding you can invest in ten shitcoins and they all lose value. I think beginners should focus more on bitcoin, it has the least volatility compared to altcoins.