Personally I bought mine just to ride it out. I will probably add a few here and there and check look at it in a few years. Its goes bust I loose a little cash. If it explodes I pay off my house. LOL!!!!!!!
They provide a wallet and very secure storage. However, because of high demand there are times you can't access the site so it's better to hold it yourself, specially if you plan to trade.
We store our Crypto on Exchanges and our own hardware wallets. Backup your private key's.
I’m asking my friend his brother does trade as a kid; he has been doing great on crypto currencies and day trading . He quit his job about 4 years ago and does all daytrading ; he clears about 300k per year
Buy on Coinbase but then move it over to a Poloniex, Kraken, or Binance account so you can flip it. NY doesn't allow Poloniex or Kraken but it does allow Binance. I'm flipping alt coins on Binance and it's instant transaction settlement with free Level 3 trading platform and charts.
You can also buy on Coinbase and then move it to Exodus which is a secure virtual wallet. That's what I do with my buy and hold stuff. You can also buy a hard wallet (USB thumb drive) for like $120