Computer Password or Personal Password

Many sites will tell you to change your password often. I use different passwords for different places and make sure that the ones I use can't be connected to me by any information I may share with others. Since my computer is mine alone, I don't worry about some things. A hacker, well some of them can do very bad stuff so I advise people to never allow anyone to add you to their messenger or contact you that you don't know. Give out as little info about yourself on the internet as possible, if you are worried about such things.