Conclusion
Understanding the use of keywords is one of the most important aspects of any Internet marketing campaign. Without the proper use of keywords, no campaign will be highly successful. Use your keywords wisely, set aside some time to perform your own keyword research, and focus on keeping your web pages relevant to the search terms that you do decide to use.
Using a combination of the high traffic and high relevancy keywords is recommended. Implementing both techniques in your ad groups will get you both traffic and sales. Successful campaigns have a combination of both highly relevant keywords that convert a very high rates, and high traffic (and still relevant) keywords that achieve higher traffic, more sales, but lower conversions. The key is to have a healthy balance of both types of keywords.
Here are a few things to remember:
Relevant Keywords Sell
Broad Keywords get high traffic but rarely make sales
High Traffic Keywords that are relevant Make Money
The keyword lists at Wealthy Affiliate will give you a very good base group of keywords, with both highly relevant keywords and high traffic keywords. If implemented properly, these keywords will make you money and will give you ideas about other keywords that you can generate from combining keywords in the lists.