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I don't understand why people create these webpages just re-explaining stuff that can be read in a book, lecture notes (usually available freely online), or wikipedia. It just adds more noise to the internet. Is it a kind of marketing thing to show their customers that they know what they are doing?

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There's value in explaining things in a different/more understandable way. Wikipedia articles and book chapters on statistics can be hard to understand.

Yes it's a form of marketing called inbound marketing. Create content that attracts people (blog posts) and then turn them into leads by getting them to put their email in for more info, etc.

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