BTC
ETH
WAN
MAN
ZRX
Other than that, just flip shit in szn and use Bitmex.
Edit: some other exchange/dex coins too, all of these are better than amost anything else given it's a good ex/dex and token has value
The only coin you need to hold is bitcoin everything else should be coins that you are willing to invest for some time but as soon as you think the price is going down you get back to the safe haven that is bitcoin, I only invest in altcoins because they have the chance to outpace bitcoin and nothing more.