Here are some hints to make for stronger passwords.

• Use numbers
• Include letters as well
• Combine upper and lower case
• Add symbols such as: @, #, ? or %
• Where possible, it should be a minimum of eight characters long. The longer it is, the more difficult it will be to guess
• Never use a sequence of numbers or letters: 123456, 987654, abc123
• Don’t use a sequence of adjacent keyboard letters either: qwer123; asd987
• Ideally, your passwords shouldn’t be something directly related to you. Don’t use your name or date of birth
• Use four random words

The following are things you shouldn’t do with your password

• Use the same password for different services, social networks, online banking, etc. If you always use the same one, if someone gets hold of it, they will have access to your entire digital world.
• Write it down somewhere: mobile phone, address book, etc. Neither should you leave it next to your computer!
• Leave it stored in browser histories. Even though it’s more hassle, it’s better to enter your password manually whenever you visit a site.

What you should do with your passwords

* There are many tools available on the Internet to check their strength.
* Change them from time to time.
* Use a password manager

Source: PandaSecurity