Here you will find links to five useful general reference sites.
This is a good starting point for any research question you may have.
An online dictionary with over 30,00 words with short definitions and example sentences. For most words there is an audio file to listen to the pronunciation.
This is a good dictionary for more advanced English language learners. It also has a link to a thesaurus.
This site calls itself "a collection of 66,506,351 freely usable media files to which anyone can contribute". A good place to search for images and other online content to use in your projects.
A version of the famous Encyclopedia Britannica. It contains brief and simple explanations together with great images and videos. On the homepage there is a link to Britannica Students with more detailed information.
A huge amount of information about every country in the world. Published by the CIA CIA is the United States Central Intelligence Agency. .