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> What I find unusual is they publish tutorials when there are plenty of good sources

In my experience, sometimes this is to flaunt/show-off/project their _percieved_ competence/understanding/knowledge of the said concepts. I know it sounds very dismissive and generalising, but I have witnessed this happen a lot of times. It seems like they don't even know what they don't know.

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Teaching other people is a great way to learn something yourself, and a lot of times you don't really understand a concept until it's explained in a slightly different way.

I really don't see the problem with people reaching out and trying to share their skills and knowledge with other people. To teach something you don't have to be the world's foremost expert on a subject, you just need to know more than the person you are teaching.

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