No one writes a tutorial to teach others, at least not for free on the internet. The real purpose is to signal their own expertise (even if they know nothing mo

No one writes a tutorial to teach others, at least not for free on the internet. The real purpose is to signal their own expertise (even if they know nothing more themselves than what is in the tutorial). You see a similar dynamic at work with business gurus giving out free investment advice, ask if they knew so much why aren’t they successful investors themselves? Or middle-managers on LinkedIn handing out their “leadership” technique.