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In this case, online blogs, or social media platforms turns out to be beneficial as they deeply give you latest updated news about the ongoing processes in cryptocurrencies.
That's the reason why selling books online are gradually disappearing. Because the demand was having low, probably this just because of modernization and every one of us are easy to browse on the internet if there's something we wanted to know? Just like using a dictionary, to be honest, I don't use a dictionary book, why should I? I used my phone for a quick result and the books we read might be outdated.
Selling a book online even though that is related to blockchain technology is has less chance will work. I strongly believe if you were personally selling at school or universities probably there is a high chance.