Richard Wagner's major work is a four-opera cycle called
http://en.wikipedia.org/wiki/Der_Ring_des_Nibelungen
Richard Wagner's major work is a four-opera cycle called "Der Ring des Nibelungen" (The Ring of the Nibelung). The cycle consists of four individual operas: "Das Rheingold" (The Rhinegold), "Die Walküre" (The Valkyrie), "Siegfried," and "Götterdämmerung" (Twilight of the Gods). Collectively, these four operas tell an epic mythological story revolving around gods, heroes, mythical creatures, and the power struggle over a magical ring.
To find this information, you can start by conducting a simple internet search using a search engine like Google. Type in "Richard Wagner major work" or "Richard Wagner opera cycle" to get relevant results. The first few search results will likely provide you with the necessary information about "Der Ring des Nibelungen" and its four operas. You can also visit websites dedicated to opera or classical music for more detailed information about Wagner and his works.