Reliable sources of information are sources that you can trust. Examples of reliable sources include scientific journals, or books published by well-known companies that publish many university textbooks.
Additional sources of information are 'user-edited sites', such as Wikipedia. When you use these sites, you should always check whether the person who checked and edited the entry is a well-known expert who lists the references he or she used.
Here are some questions you can ask to help you evaluate a source of information:
Who is the author of this information?
What are his or her qualifications?
When was this information published or last updated?
Why was this information written?
Was it written to inform me, persuade me, entertain me, or sell me something?
What is missing from this information, and why was this left out?
