People might give good advice precisely because they know “what NOT to do”.
For example an addict would advice not to take up recreational drug or drink too much because you run a risk of becoming an addict. Because that’s what happened to them. Or someone in a bad marriage would advice others to avoid particular people or situation so they don’t end up like this. Or people diagnosed with cancer would advice others to do timely check ups because they didn’t.
Etc etc etc etc
I think it’s different than people advising on things they know nothing about
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