1
Storing crypto secret keys directly in a browser or laptop is dangerous because a compromised machine allows attackers to steal keys and irreversibly spend funds.
2
Anyone possessing your secret keys has full authority to spend and transfer your crypto assets.
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Option 1 involves keeping funds on an exchange or using custodial services (acting like banks) that manage the keys safely on your behalf.
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Option 2 involves using hardware wallets (such as Ledger), which are physical USB devices that store secret keys securely offline.
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Hardware wallets require physical user interaction, such as touching the device, to sign transactions, ensuring that a compromised laptop cannot steal the keys or authorize unauthorized spending.
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Option 3 uses a co-signatory service (such as BitGo) requiring multi-signature authorization, meaning transactions need signatures from both the user and a third-party service to execute, adding an extra layer of security even if the physical device or laptop is stolen.