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.

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.

China's Chang'e-4 lander touched down on the Moon's far side in January 2019. Using instruments including ground-penetrating radar, the mission collected subsurface profiles near its landing site. A team writing in the Journal of Geophysical Research: Planets reports the top roughly 130 feet (about 40 metres) of the surface is layered—alternating dust, soil and broken rock—and that a buried impact crater lies within those layers.

New YouGov research across Western Europe and the United States finds a gap between people’s agreement with gender-equality principles and their willingness to call themselves 'feminists.' Respondents were randomly assigned one of three question formats: the word 'feminist' alone, a definition of feminist principles, or both. When asked the word alone, only 15–48% claimed the label; when given the definition, 74–91% endorsed equal rights, while the combined definition+word question produced 45–77% support.

Spain's annual Tomatina festival draws thousands each year to the town of Buñol, where participants playfully pelt one another with overripe tomatoes. This year about 15,000 people, many tourists, threw roughly 120 tonnes of fruit, turning streets and buildings into red pulp. The event lasts about an hour, and people commonly wear goggles and old clothes; there is a small participation fee of about €12 to help manage the crowd.