Device targeting means choosing which devices will see your ads, like mobile phones or desktop computers. A simple way to use it is to check where your results are better. If most sales come from mobile, you can increase your bid for mobile users. If desktop users spend more money, focus there. Also think about the product. Quick, low cost offers often work well on phones, while detailed services may perform better on desktop. Start with all devices, then adjust based on data. Does this method sound practical for beginners?