I have a portfolio of crytpo on Coinbase. I am not recommending you do it, but if you do, I would start with them. It's the easiest to maneuver and it wasn't like Fort Knox to be able to add a funding source. Again, I don't profess to completely understanding cryptocurrency but I started with some Bitcoin on Coinbase. I sold that and now I have about 12-15 other investments. It's a brave new world! But be smart. Only invest what you can afford to lose and BE PATIENT.
Fun fact: Coinbase also gives away free crypto if you take a few easy quizzes.
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