Bitcoin Wallets - Which, what, why?
Pretty broad question. I personally prefer hardware. Convenience and ease of use. Less chance for screwing it up, especially for non-technical users.
More on wallets here
Cryptocurrency Wallets and Why You Need One - The Cryptocurrency Forums
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But, Don't you think digital wallets are more convenient than the hardware wallets?
Personally no. Securely setting up desktop or mobile wallets requires so many steps that can be compromised. The average user isn’t going to create a USB drive to hold private keys offline or use air-gapped offline computers for currency storage.
A hardware wallet like the Trezor or Ledger products provides nearly the same security and safety of a wallet created using the most secure methods but in a form that requires simply plugging in and sending a transaction. Receiving can be done anytime regardless of whether device is connected. And yet no one can get to the private keys, as they are stored encrypted and offline, never exposed to the internet.
The strictest encrypted software wallets are difficult to create without screwing up. Mobile wallets and online wallets can be hacked or phished. Hardware wallets involve none of that.
the wallets like the Trezor or Ledger can be used to keep altcoin?
Trezor supports bitcoin, bitcoin cash, litecoin, Ethereum via MEW, Dash, NEM, zCash, Ubiq, Monacoin, Digibyte and can be used with Mycelium.
Ledger Nano supports a larger list Ledger Wallet - Cryptocurrencies
Both can store all ERC20 tokens.
For anything else, you’ll likely have to use the project’s official wallet.
Do you have any experience that how this wallet works and it is safe to use these wallets??
I use both Trezor and Ledger hardware wallets. There are a ton of reviews out there. Practice safe setup and good PW and PIN strategies and they’re as safe as the best encrypted offline cold wallets.