As a newbie, I have little experience in choosing a promising altcoin and there must be some important thing that I don't know now in the process of choosing a altcoin. I want to stand on the shoulders of giants and I hope you can teach me something. Thank you.
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First learn about the crypto market, you can try Block geeks and follow their articles to get a sense on altcoin. There are so many coins but find the project that you understand , love and will stand by.