Use different passwords for every account you use to limit any damage that can be done by hackers. Use a unique email when opening accounts on each exchange and only use that email address for that specific exchange.
 Enable two-factor authentication for your exchange accounts. This adds a software to your smartphone which adds extra security to your account. Without two-factor authentication, a hacker only needs your username and password to empty your balance.
Maintain backups of your cryptocurrency wallets and recovery phrases to ensure your coins aren’t lost for good if something happens to your main device. External hard drives, USB sticks, and encrypted backup files can be used to secure your recovery options and programs like VeraCrypt can encrypt these sensitive files.