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I just found Marketing-for-Engineers on GitHub. GitHub is a version control system hosting website whose major users are software engineers.
After browsing the resources on it, I think it’s actually a “marketing for all people”. Resources on this webpage (repository) include not only user research, marketing without budget, content marketing, but also Psychology in marketing, business model and pricing, and more.
Marketing is of course a profession, but in this Internet and open resource era, we all can do some marketing.