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Would you recommend diversifying then? I have only studied Bitcoin, Ether, and Steem. I haven't looked much into Litecoin, yet.

I would. I think it is risky to hold only one cryptocurrency even if it is Bitcoin (which is probably the safest). I think most things in the top 20 are relatively safe bets - always read up on the project and see who the people are behind it. I only invest in things I believe in now.