Hot wallets are not secure to store cryotocurrency because it is only made for the day to day usage like buying but mostly people uses hot wallets are traders.
Coinbase wallet is also a hot wallet but you can't store all the altcoins in it the supported coins are BTC,BCH,LTC and ETH and your coins are not secured here so it is not advisable to store big amount or storing for long term.
Software wallets or hardware wallets are meant to be storing of cryotocurrency so you can install one of them to store your altcoins.