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So, the main question is that Is it risky to invest in new crypto coins/tokens? or it is good for a very certain time of investment?
Always keep in mind that there is risk involved when investing in cryptocurrencies.
You need to learn the basics first, think also these new coins/tokens are risky, I can say they are high risk, high reward.
If you're interested in investing in cryptocurrencies, it might be wise to start with well-known coins like Bitcoin or Ethereum and then think about investing in more recent coins after conducting careful research.