Just about any 'advice' that is illustrated by cherry picking. I.e. had you picked this stock (which we retroactively selected out of the thousands we advised over the years), you would have made 10,000% return! Sign up now for your subscription. Or, notice from the example how if you had bought when MA x crossed MA y, and sold when MAy crossed MAx, you would have made ___!
Same goes for fib or any other anecdotal type evaluation and conclusions.
All myths that are propagated (unfortunately) in about 90% of the 'TA' books out there. As you begin to evaluate the information from a statistical perspective, many of these myths begin to crumble quickly.
The only guaranteed constant in this field is negative commission bias.