Nothing to do with investment
.....a blanket term to cover entities held in a blockchain. Bitcoin is the most famous. Any list we give here would be out-of-date tomorrow.
.....but not for you
There are a small handful of professionals worldwide who are capable of trading crypto with reasonable odds of making money. You are not one of them. But if you enjoy playing roulette and you bet only what you can afford to lose, why not? Except you have no idea what the odds in favour of the house are.
.....although they are are important.....
......as a totally fascinating development in the world of money, with deep future significance for international power structures. But that's another story.