# FAQ

- [What is cold wallet?](/docs/coinwallet/faq/what-is-cold-wallet.md)
- [What are gas fee?](/docs/coinwallet/faq/what-are-gas-fee.md)
- [What is inactive address/account on TRX?](/docs/coinwallet/faq/what-is-inactive-address-account-on-trx.md)
- [What if I send crypto to a wrong address?](/docs/coinwallet/faq/what-if-i-send-crypto-to-a-wrong-address.md)
- [What is 'The address TRX balance is less than the gas fee required'?](/docs/coinwallet/faq/what-is-the-address-trx-balance-is-less-than-the-gas-fee-required.md)
- [How to recover assets wrongly transferred to the same address on different blockchain?](/docs/coinwallet/faq/how-to-recover-assets-wrongly-transferred-to-the-same-address-on-different-blockchain.md)
- [Why do I need to approve token?](/docs/coinwallet/faq/why-do-i-need-to-approve-token.md)
- [What is Hierarchical Deterministic (HD) Wallet?](/docs/coinwallet/faq/what-is-hierarchical-deterministic-hd-wallet.md)
- [What is wallet security upgrade?](/docs/coinwallet/faq/what-is-wallet-security-upgrade.md)