Looking at the Foundation, the history development and the target of one coin can help you find out a good coin. IOTA, Monero, Ripple, Ethereum are those coins.
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I believe the best way to find a good coin in the market is by knowing the community and the foundation; you need to know how many people supports that coin, just like many supports Bitcoin. The price rate of a coin doesnt matter, all that matters is the number of people that are into investing in that particular Coin.