A Guide to
The Best Google Search Cheat Sheet: Tips, Operators, and Commands to Know
This Make Use Of article lists many common operators, such as OR and quotation marks, that can be used to create more effective Google searches.
A page offering "How to" guides that give instructions for customizing your Google searches. The page's "Tips for searching" section is particularly helpful.
Yahoo Directory - Unlike Google, Yahoo Directory contains websites that are indexed by humans and placed into categories. This can be a much more productive way of searching for information depending on what you're looking for.
DuckDuckGo - For users with privacy concerns, DuckDuckGo is a search engine that offers functionality similar to Google but has a no-tracking policy for users' searches. This search engine also avoids what is known as the filter bubble and, unlike Google, displays the same results for all users.