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.

Archaeologists in Poland have uncovered the skeleton of a child from the 17th century in a graveyard near Dąbrowa Chełmińska. The body was interred face down, and a small triangular padlock was placed beneath the foot bones. Researchers interpret the unusual position and the lock as deliberate measures connected to local burial customs intended to prevent the deceased from returning to harm the living.

Research compiled by YouGov shows that the COVID-19 pandemic prompted different changes in daily routines around the world. In some places people slept more—Saudi Arabia, Brazil, China and Turkey reported increases—while Australians and Britons admitted to drinking more and residents of Mexico, Brazil and Spain reported cutting back on alcohol. Exercise rose in countries including China, Saudi Arabia, Mexico and the United States, and various nations reported shifts in diet quality.

Sarah Ogilvie’s The Dictionary People tells the story of the people who built the Oxford English Dictionary by collecting words, quotations, and regional usages. Ogilvie, a linguist, shows that the OED was not made by a single team in isolation but by thousands of volunteers who sent slips of paper and examples from newspapers, books, and everyday speech. The book explains how this wide network of contributors helped record English across time and place.

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.