Investing on Bitcoin is the best think to do if you cant decide on what else to buy. I think bitcoin will be trillion dollars market cap in less than a decade. Any opinion?

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I think it is the best crypto currency. Since it's considered as the main coin and many users are acknowledging it. If you don't have any ideas about other crypto currencies it's better to start with BTC. It's a good coin to invest since it's growing fast and steady.