Google Scholar searches for many kinds of scholarly materials such as journal articles, research reports, dissertations and theses, technical reports, patents, and more. Most undergraduate users will want to limit journal articles.
When you do a search in Google Scholar, you get a list of citations. You'll get links to the full text:
We don't really know how Google Scholar indexes items, but this is how Google Scholar defines the weighting system:
"Google Scholar aims to sort articles the way researchers do, weighing the full text of each article, the author, the publication in which the article appears, and how often the piece has been cited in other scholarly literature." The most relevant results will always appear on the first page. (http://scholar.google.com/intl/en/scholar/about.html)
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