Reference sources (encyclopedias, dictionaries, etc.) are useful in three ways:
Although Wikipedia articles can sometimes be interesting starting points and provide useful links to other sites, they are not as rigorously reviewed as articles in conventional encyclopedias. So approach with caution, and always check the Talk tab - that will tell you the rating assigned to the article (by generalists, not scholars):
"Start-class" is not a good sign - it indicates that the article is incomplete and lacks sources.
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