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 recent poll of 2,000 British adults found many people follow celebrity news more closely than the lives of family and friends. Forty-four percent said they cared about trivial celebrity matters, and 80% admitted they knew more about celebrities than their own parents. Nearly half reported knowing more about famous people than about their friends. Sixty-one percent believe the media spends too much time on celebrity coverage.

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.

A new international nature fund set up under the Global Environment Facility aims to help developing countries meet the biodiversity targets agreed at the COP15 summit in Montreal. The fund’s creation was one of the most-contentious issues at those talks, prompting walkouts and repeated negotiations between wealthy and poorer nations. So far, only Canada and the United Kingdom have pledged money, leaving roughly $40 million still needed to capitalise the fund ahead of COP16 next year.

Google is expanding a tool called "Results about you," first introduced last year to help people remove personal information from Search results. The new version will actively scan the public web for instances of a user’s personal data and send alerts so they can request removal. Google says the feature is currently available in the United States in English and will be rolled out to more regions over time.