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Expect the panic when a certain coin gets reported it will go down sooner in price, and from that take it as an opportunity to buy more. This applies to me in Bitcoin, and I am not sure if those applies in other coins since many alts are gonna end up a shitcoin when dumped by the investors.
Right but for the shit coins to be dumped it doesn't even need bad news!
Regarding Bitcoin I think buying the dip with a reasonable amount is almost never a mistake. If you have good financial management and don't go all in with your cash when Bitcoin drops 10%, I think you are good to go. The more it goes down, the higher the room for it to go up again. The most important variable I think is time. It may not recover tomorrow, but it probably will eventually.