Understand what a wallet actually controls, how addresses and keys relate, why recovery phrases are dangerous to share, and how self-custody differs from exchange custody.
A crypto wallet is software or hardware that manages cryptographic keys and helps you create and sign transactions. The wallet does not literally contain coins like a physical wallet contains cash.
An address is a destination identifier that can usually be shared to receive assets on a compatible network. Addresses are network-specific and can have different formats.
A private key is secret cryptographic material that can authorize actions for an account. Anyone who obtains it may be able to control the associated assets.
Many self-custody wallets use a recovery phrase to recreate key material. Whoever has the phrase may be able to restore the wallet on another device.
Hot wallets keep key material available on internet-connected devices. Cold-wallet approaches are designed to keep key material more isolated from everyday online exposure.
With self-custody, you control the keys. With custodial services such as many exchanges, the service controls the underlying keys while giving you an account interface.
Connecting a wallet to a site does not automatically mean funds move. A signature can prove control or authorize an action; a transaction can change blockchain state and may cost fees.
On smart-contract networks, token approvals can let a contract spend specified tokens on your behalf. Poorly understood approvals can create risk.
A backup should let you recover access if a device is lost. Digital screenshots, cloud notes and messaging apps can expose secrets.
Before using a wallet, verify the app or hardware source, secure the device, protect the recovery phrase, and understand every signing prompt.
Before moving money, connecting a wallet, trusting a claim or signing a transaction, slow down. Identify the exact asset, network, contract, source, permissions and risks.