Car repair is another. I drive a 20+ year old vehicle. You'd think that there would be tons of articles about repair since the world has had 20+ years to reverse engineer it, right? The first two pages of Google results are almost always SEO spamfests. It was almost impossible to find out how to change the burnt out lights in my car's gauge cluster since every link took me to a bad copy of Quora with each answer recommending the automotive equivalent of essential oils.