#CryptoSecurity101 > Many people enter the world of cryptocurrencies like $BTC and $ETH without paying attention to the simplest security rules!

One of the biggest mistakes is leaving coins on exchanges without enabling two-factor authentication (2FA) or ignoring periodic password updates.

Also, sharing your private keys with anyone, even a friend, is very dangerous.

Beware of phishing links, and do not click on any link you receive unless you are sure of its source.

Remember that protecting your digital assets is your personal responsibility; no one can help you after a hack!

Make sure to back up your wallets in safe, offline locations.