Well I see only 200, but there may be thousands someday. Many will go bust as well.
Playing this like any other commodity, may produce some really big money if you get in at the right price, and get out at its apex.
I still believe precious metals will be the long range thing to have. If you play the game right, you might end up with even more precious metals then you could with just the fiat currency you may currently have.
IIRC, there are over 300 currency exchanges. I believe the most popular is Coinbase. That’s what I use.
FWIW
At the end of the 200 visible is a button to "Load More". or https://www.coingecko.com/en 78 pages worth with 100 per page. There are many thousands already and yes, most of them will go no where or disappear. 7,800 cryptos -- insane.
It shows 200 per screen. I saw 4800 before I gave up hitting the load more button.