A password is a word or string of characters used for user authentication to prove identity or access approval to gain access to a resource. Keep it secret from those that are not allowed to access the server. Use a complex and long password, it should be easy to remember and unique according to you but not easy to guess for others. Don't use `admin123` or `admin` etc. that are easy to guess and dont use birthdays, name of your wife etc. A good password should also contain special chars lik '.!;/' (not just the characters a-c and 0-9). Use upper and lower case characters in the password.
Furthermore, try and not to use the same password more than once.