crypto currency investing, anyone?

And you bring up a good point...diversification

This will not be my 401K or other retirement plan
This is just a "toe in the water" type thing for now
That’s the phase I’m still in.

I recommend sticking to a reputable exchange like Coinbase or Biannce.US . Those two were the earliest exchanges and have not only been vetted, but they’re legit companies here inside the US so they have to follow more laws that offer a bit more protection against fraud than some of the foreign operated exchanges.