What is a Crypto Hardware Wallet? How Does It Work? Trezor, Ledger etc for Bitcoin, Ethereum

What is a hardware wallet for a cryptocurrency? A crypto hardware wallet is a specialized device that helps store your private keys and sign the transactions. How is it different from using an app like MetaMask or Trust Wallet? For Bitcoin, Etherum or other blockchains?
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To understand this, you need to learn how transactions happen on blockchain and the process of signing a transaction. Let's learn all these things and understand how hard wallets work? Do you need one? Whether are they safe? And which one should you go for Trazor, Ledger, Safepal, or any other wallet.
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