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.

Harvard astronomer Avi Loeb says researchers recovered small metallic spheres from the Pacific Ocean in June and that the material came from outside our solar system. Loeb connects the spheres to an object that reportedly struck Earth in 2014 and argues their composition and structure are unusual enough to suggest an extraterrestrial, possibly technological, origin. The claim is presented as a potential example of interstellar material reaching Earth.

A 40-year-old British doctor touring South Africa was shot and killed in Cape Town after turning into Ntlangano Crescent during violent street protests, authorities said. The incident occurred last Thursday when the general practitioner took a different route after leaving the airport. Multiple unidentified suspects confronted him and opened fire; he did not survive. South African police confirmed the death and said they were investigating the circumstances and seeking the attackers.

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.

Ellis Pinsky, who grew up in Irvington, New York, has been linked to a large cryptocurrency theft that investigators say happened when he was 15. Authorities allege he orchestrated the theft of about $23.8 million in digital assets. By May 2020, masked intruders were reportedly trying to access some of the stolen funds, but Pinsky apparently no longer had the money. The case attracted attention because of the amount and the age of the alleged organizer.