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Of course, the best thing you can buy is ETH

Sure, and also XRP, better look through the sites market capitalization and decide there.

Well I don't know, by classic you can buy the most popular cryptocurrencies that are in everyone's ear, you won't miss out.

I don't know, at this point it's hard to determine what's promising and what's not, because right now everyone is in anticipation of bitcoin halving. Buy what you like best for now, especially since...

Great, there you go, it's all good, it's always better to figure things out for yourself. You only bought DOGE? In the upcoming bullrun, better buy more coins and not only in erc20 network.

Did you go to the exchange site at all? There are already memecoins there, even DOGE, be more careful. Most likely the rest of the coins will be added as they evolve further.