The first way is to look at the price. If the price of a pair of Nike shoes is very high in official website, but the price you sell in Taobao is very low or only half the price, it must be fake.
The second way is to see if the logo is true or false. Although Nike's trademarks are similar, you can still see some subtle differences yourself. Real Nike trademarks are round, delicate and smooth, while fake ones will be deformed, and some even add special imperceptible trademarks to mislead consumers.
The third method is to look at the bar code. If the bar code of your Nike shoes can be scanned by mobile phone scanning software, then these shoes must be fake, because the bar code of real Nike shoes can't be scanned. The bar code of real shoes consists of two vertical lines with different thicknesses, and all other forms are fake.