Very good information but can you tell me which hardware wallet is best and from which sites i can buy it?
I recommend to buy directly from their official site for more safety
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Trezor-
LedgerHello.
I use the online wallet myetherwallet so is it safe for me or i have to buy the hardware wallet?
No need to buy hardware wallet if you dont want it, just import it to ethereum dekstop/android wallet using your private key or your wallet file for more safety. But hardware wallet still the best choice so i recommend you to buy it if you want.