How to choose a strong password and safe from hackers clear guide...

So how do you have a "strong" password that is easy to remember? While it may seem difficult to do this, there are a few simple tips that can make it easier. Note: The examples below illustrate only the concepts discussed. A single technique should not be used alone, but should be used with other techniques. Combining several will produce a strong password.

Choose :

You want to choose something that is easy to remember with a minimum of 8 characters that uses as many of the above techniques as possible. One way to do this is to choose a phrase that you remember, choose all the first or last letters of each word, and then replace some letters with numbers and symbols. Then you can capitalize some letters (maybe the first and last, or the penultimate, etc.). You could also keep or add punctuation.

• Use a mix of alphabetical and numeric characters.
• Use a mixture of upper- and lowercase; passwords are case sensitive.
• Use symbols if the system allows (spaces shouldn’t be used as some applications may trim them away)
• Use a combination of letters and numbers, or a phrase like “many colors” using only the consonants, e.g., mnYc0l0rz or a misspelled phrase, e.g., 2HotPeetzas or ItzAGurl .

• Pick something obscure:
• an odd character in an otherwise familiar term, such as phnybon instead of funnybone;
• a combination of two unrelated words like cementhat
• An acronym for an easy to remember quote or phrase (see below)
• a deliberately misspelled term, e.g., Wdn-G8 (Wooden Gate) or HersL00kn@U (Here’s looking at you).
• Replace a letter with another letter, symbol or combination, but don’t be too obvious about it.  Replacing o with 0 or a with 2 or i with 1 is something that hackers just expect.  It is definitely better than nothing, but replacing 0 with () would be stronger as it makes your password longer and is not as obvious
• An easily phonetically pronounceable nonsense word, e.g., RooB-Red or good-eits .
• Two words separated by a non-alphabetic, non-numeric, or punctuation character, e.g., PC%Kat or dog,~1#

Do Not Choose :

• Your name in any form — first, middle, last, maiden, spelled backwards, nickname or initials.
• Any ID number or user ID in any form, even spelled backwards.
• Part of your userid or name.
• Any common name, e.g., Sue, Joe.
• Passwords of fewer than eight characters.
• The name of a close relative, friend, or pet.
• Your phone or office number, address, birthday, or anniversary.
• Acronyms, geographical or product names, and technical terms.
• Any all-numeral passwords, e.g., your license-plate number, social-security number.
• Names from popular culture, e.g., Harry_Potter, Sleepy.
• A single word either preceded or followed by a digit, a punctuation mark, up arrow, or space.
• Words or phrases with all the vowels or white spaces deleted.
• Words or phrases that do not mix upper and lower case, or do not mix letters or numbers, or do not mix letters and punctuation.
• Any word that exactly matches a word in a dictionary, forward, reversed, or pluralized, with some or all of the letters capitalized, or with any of the following substitutions:
• a -> 2, a -> 4, e -> 3, h -> 4, i -> 1, l -> 1, o -> 0, s -> $, s -> 5, z -> 5

An article by Munna Suprathik