4. Don't Use same password for a long period of time.
This is the most common mistakes people do in the cyberspace. Sometimes we even use the same password across different platforms including confidential documents which has lead to many compromising their security across multiple platforms.
Although most times the worries with Most people is the fear of forgetting some passwords but to me it's safer to click on the forgot password route as many times as possible than to become vulnerable due to lack of precautions while using the cyberspace.