Honestly, there are so many cryptocurrency exchanges out there. Especially if you are on Twitter and look up #bitcoin you might see all kinds of exchanges and offers to buy crypto. Beware of the scams out there and do your homework.
Use Coinbase. They are a reputable company and have been in the business for a long time.
Don’t trade cryptocurrency within the coinbase app or website. The fees are high especially if you exchange your crypto for cash and cash out. To pay little fees, use Coinbase Pro | Digital Asset Exchange after you sign up on coinbase.com.
Earn crypto while learning about crypto
Discover how specific cryptocurrencies work — and get a bit of each crypto to try out for yourself.