Always remember to evaluate the quality of the site you are viewing.  Don't believe everything you read unless the information comes from a reputable or reliable source.  

Consider authority, accuracy, objectivity, currency, and completeness as you evaluate whether to utilize the information found on a particular Web page.

2 short videos introduce Boolean search techniques:

• Boolean Operators  (AND. OR. NOT)
• Boolean Modifiers. ( “ ,  * ,  “ )

[How Library Stuff Works, McMaster Libraries]