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If you are talking about putting all your money on one exchange or invest in single cryptocurrency? I think a lot of exchanges are good to use for crypto trading and as a storage of your crypto wealth. However if you want to do this make it sure that you don't put all your money on one crypto exchange because it is quite not good. because we noticed that several news of hacking activities that occurs on crypto exchanges so for me it is not good idea to put your all money in a single market or crypto wallet.