Tip 3. Global Negative Keywords.
You don’t want people finding your add when they are searching for free stuff if you are selling something. This may sound obvious to some but do some searches and you will see it happening. Use the word FREE in your negative keywords and you will never pop up in a search that contains the word FREE. Using negative keywords is especially important if you are using broad matching.
So what are negative keywords?
Negative keywords are a core component of a successful keyword list. Adding a negative keyword to your ad campaign means that your ads will not be shown for searches containing that word. You will save money by filtering out unwanted queries and you will find that you then reach the most appropriate prospects, reduce your cost per click and increase your return on investment.
How to use them.
You add a negative keyword the same as you would add a normal keyword. The only difference is that you add a negative sign (-) before the term (with no space between the negative sign and the first letter of the keyword).
-free would stop any searches with the word FREE in it from showing up.
Imaging you own a Bag company that sells canvas and plastic bags. You would not want people that search for Leather Bags to see your advert and click on it as that would cost you money and they are not looking for your product.
Adding the negative keyword -leather would stop any searches with the word LEATHER in it from showing up. This would filter out any of those searches meaning that you get better targeted advertising.
Hope this helps.