Use a different password for each of your important accounts, like your email and online banking accounts. Re-using passwords is risky. If someone figures out your password for one account, that person could potentially gain access to your email, address, and even your money.
Using numbers, symbols and mix of upper and lower case letters in your password makes it harder for someone to guess your password. For example, an eight-character password with numbers, symbols and mixed-case letters is harder to guess because it has 30,000 times as many possible combinations than an eight-character password with only lower case letters.
Create a unique password that's unrelated to your personal information and uses a combination of letters, numbers, and symbols. For example, you can select a random word or phrase and insert letters and numbers into the beginning, middle, and end to make it extra difficult to guess (such as "sPo0kyh@ll0w3En"). Don’t use simple words or phrases like "password" or "letmein," keyboard patterns such as "qwerty" or "qazwsx," or sequential patterns such as "abcd1234" which make your password easier to guess.
Don't leave notes with your passwords to various sites on your computer or desk. People who walk by can easily steal this information and use it to compromise your account. If you decide to save your passwords in a file on your computer, create a unique name for the file so people don't know what's inside. Avoid giving the file an obvious name, such as "my passwords." If you have a difficult time remembering multiple passwords, a trusted password manager may be a good solution. Spend a few minutes checking out the reviews and reputations of these services.