Buy BTC/ETH/whatever on coinbase or another exchange that allows fiat purchases using a credit card or a bank transfer. send it to an exchange like Binance to trade for a wider variety of shitcoins.
If you do sign up for Binance, please use my referral ID: 10863807. I'll get a small commission when you make trades and you can do the same if you invite others.
Nolan Lewis
Another note: if you choose Binance, buy some BNB and use it to pay for fees. You'll avoid "dust" which is a big complaint of the exchange.