Can hardware wallets like Ledger Nano be hacked and their coins stolen?
There will always be theoretical vulnerabilities. One vulnerability in practice is when fake ones are sold to unsuspecting buyers giving the makers of the fake hardware wallet access to the user's private keys. In practice, it's very difficult to have your coins stolen with such a wallet.
Thats why its advisable to reboot your new hardware wallet and generate new phrases to make sure youre on a safe place. Yes, its safe as long as you keep it private and put the keys into your treasure box. Ill soon experience to use a hardwallet and Im confident that it will be a safe wallet for me. Go buy to the real seller and have your piece of mind with that Ledger.