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So 3/4 of the tips are: write a book people want to read?

No clearly, the message is, write self-help books for wannabe writers.

Self-help books for wannabe anythings is not a bad idea. Imagine a self help book for wannabe app developers.

During a gold rush, sell shovels.

If this was obvious advice, the mistake wouldn't be so prevalent in among non-fiction authors.