BTC is the best choice to reduce the worst risk, but that doesn't mean investing in BTC will always be profitable, it's just that you have to know when the right time BTC reaches a low level, Eth is also one of the strongest coins after BTC. These are the top two series of coins that are popular with investors, it's good if you have reserve funds in my opinion it's better to buy both of these coins.

But it would be nice if you have your own ideas about which coins to invest.