Keywords are the core of your research idea. To generate them, think of the perfect article you'd like to find: what words would appear in there? Remember that keywords don't have to be one word. You can use multiple keywords to search for the same idea. Be creative!
Once you have selected some keywords, you can combine them with Boolean operators. Catalogues and databases respond to this type of logic.
|to narrow||online AND privacy|
|to broaden||internet OR online|
|to limit||NOT email|
|to search for a phrase||"privacy settings" ...only retrieves the two words together|
|for alternate spellings||e?mail ...retrieves e-mail or email|
|or.||for different word endings||protect* ...retrieves protect, protection, protected, etc.|