Professor Punsley's Whodunit 101 series: where the plot thickens, but not too thick.
Red herrings are like breadcrumbs, but for your brain. They lead you away from the real clue, and into a dead-end alley of confusion.
A classic red herring: the suspicious-looking stranger seen lurking around the scene of the crime, but actually just a guy on a phone call with his mom.
Exercise 1: Identify three real-life red herrings in your favorite detective novel or movie. Bonus points if they're from the same book/movie as the first.
Learn how to craft your own red herrings, or jump straight to the next lesson and risk losing all your carefully laid red herrings.