Reliable Information and Tutorials

Search Engines We Recommend
Infotopia has fewer ads and librarian selected links; it is powered by Google and gives a more limited but highly useful selection of results.
Internet Public Library has long built excellent search results.
Kidtopia is the elementary version of Infotopia and is a safer search for kids.
InstaGrok will yield print and media search results. You must use a Chrome browser, not Internet Explorer.
Duck Duck Go will organize search results by subject groupings--very helpful if you are researching common words.
Academic Info Browse by subject.
DMOZ Open Directory  Browse by subject.
Tutorials, Homework Help, & Videos
Khan Academy offers help in many subjects.  Also has good educational videos.
Quiz Hub is geared for high school.

Sites We Do Not Recommend
Wikipedia--information is not guaranteed to be accurate
Ask.com--like Wikipedia, information in not guaranteed to be accurate