Web Search Engines and their add-on directories, provide access to varying portions of the World Wide Web. You will need to learn to use two or three of these services to effectively locate material on the Web. Each search engine indexes a slightly different group of websites and works just a bit differently from other search engines. The following sites provide good advice.  Hot Tip: Most of the time you can locate what you need on the Web by using Google, Infomine or lii.org from the library's homepage. 

Web Searching Tips from Search Engine Watch| Search Engine Features from Search Engine Watch