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Most website designers ask me if they should even bother adding keywords "meta tags" when designing a clients website and if it will make any difference anymore now that Google has changed the rules. Just for some bit of history before you could have as many keywords as possible for your website to help attract customers searching within those words but Google quickly caught on that it made competition extremely difficult. Many websites were adding words that didn't apply to the website and made it harder for searchers on Google to find the proper website.
The updated rule of thumb is you are still able to have them but under a small amount (TIP: 10 OR LESS) making it more effective to find websites because now they are only able to add words that directly relate to the website at hand.
Tip: make sure you don't waste your 10 words trying to use plurals because Google only sees the single value of the word and includes plurals automatically. Also you are not able to have a string of more then one word as a keyword term.
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