Item 14 says if -w3 is added the search result would be better. The symbol "-" isto filter out the results , but in this example whar does it mean to filter out "W3" mean ?
>img html
>will return inferior results compared to:
>img html -w3
>img html
>will return inferior results compared to:
>img html -w3
Personally I find most of their content to be pretty decent, so I wouldn't filter it out as a rule.