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First of all, it’s essential to keep the CMS (WordPress / Joomla / Drupal etc.) used to develop your website and its plugins up to date.
CMS vendors regularly release security updates to close loopholes used by hackers.
1- A password must be at least 8 characters long, more is better.
2- it must never be a word found in the dictionary of any language. Password cracking software has dictionaries containing hundreds of thousands of words in every language, and looks for every combination. It takes from a few minutes to a few hours to crack these passwords very easily.
3- A good password contains letters, numbers, special characters, upper and lower case.
4- Don’t use the same password for FTP, SQL database, e-mail, website administration interface. The hacker knows that if he finds your password, chances are it’s the same password elsewhere! Many web hosts offer a unique password to “simplify” management.