Tip #7: Review results consistently.

You'll waste time and money if you don't keep checking which keywords attract specific customers. You can not only pick and choose the optimal keywords, but you can also track which ones pull from which engines. You also learn which engines deliver customers who choose certain products or services. The key is, keep checking back as time passes. New buzzwords or slang, or perhaps a change in society or opinions can all have an impact on the success of your chosen keywords.