1. Take a very heard password.
2. Keep your password in a very secure place.
3. Don't save your password in online.
4. Activate two step authentication.
5. Don't share your password to any one.
Nice tips, but still, I prefer hardware wallet instead using online wallet, because online wallet is more vulnerable to hacking because it's "online" word. Just don't act reckless if it about your wallet, it will make your wallet much safer than before.