The best way to learn to spot a conspiracy theory is to make one yourself.
Pick a real news story. On the next step you'll choose who's behind it and why. Then walk through the four moves real conspiracists use, with a debunk on every step.
Choose whichever real-feeling headline your imagination will run wildest with. Don't overthink it.

Garry Kasparov, the Russian-born former world chess champion, has publicly endorsed Anatoly Fomenko’s “New Chronology,” a radical revision of world history. Fomenko’s thesis argues that much of what we call ancient history is misdated or duplicated and that the actual historical timeline is far shorter than commonly believed. Kasparov says he finds the questions it raises important and plans to spend more time promoting these ideas as he moves away from professional chess.

A YouGov–Cambridge Globalism Project survey asked people in many Western countries whether more should be done to improve women’s rights at home. In several nations a clear majority or near-majority said yes. Italians topped the list at 62%, followed by Spaniards at 60%, Hungarians at 57% and Swedes at 56%. Other countries where roughly half of respondents expressed concern included Poland, France, Canada, Australia and Greece.

Online tools now let anyone view past versions of websites, exposing changes that site owners may have made over time. The Wayback Machine at archive.org stores snapshots of millions of pages, while archive.today preserves copies that sometimes survive when other archives don’t. The Memento Project links these services and helps users search by URL and date, making it easier to see how pages, policies, and content evolved.

Scientists have identified Burgessomedusa phasmiformis as the oldest known swimming jellyfish, based on fossil specimens recovered from the Burgess Shale in Canada. These animals lived more than 500 million years ago during the Cambrian period. Researchers classify them as medusozoans, the group that includes modern jellyfish, and say the fossils provide direct evidence that jellyfish-like animals had already evolved by that time.