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fireballs619 · 4119 days ago · link · · parent · post: To what extent can you actually teach yourself a subject?
I do suppose you are right that anyone can claim they are an expert online. However, in certain areas such as math or (some) sciences, this claim is verifiable by seeing if what they said works out! Sometimes it just takes someone pointing something out to make things click, and in reality that person need not be an expert.