Some keywords bring traffic but never bring clicks or sales, and it took time to understand why that happens. Very general keywords or keywords meant for free downloads, definitions, or school research usually do not lead to affiliate clicks because the visitor is not planning to buy anything. Targeting those keywords can bring visitors but no income. It may be better to focus on keywords that show a problem, a need, or product interest. Avoiding the wrong keywords can save a lot of time. Which keywords do others try to avoid?