Before we start adding negative keywords, we will need to find the searched keywords first.
When you select your campaign you can ether first select your ad group.
When you are in the dimensions tab under view, select search terms.
Now that you have found your search terms you can start by excluding them.
Go and click on the keywords tab
Scroll to the bottom of the page and you will see negative keywords, click on the plus sign if it’s not already opened.
You can now add negative keywords to ether the ad group or the whole campaign. A good tip is when you have a keyword for example review you would want to add it as a Negative keyword in the shared library so that you can use the same negative keywords for other ad groups or campaigns.
Make sure you know the difference between, broad match, exact match and phrase match.
And that is it, there is a whole level of human physiology when it comes to the search terms so it is very easy to accidentally add negative keywords that are actually needed to find your products.
Or to add it in the wrong match type.