1. Contain enough keywords to match with available inventory. On the other hand, too many keywords decreases the effectiveness of the targeting.
2. Not include phrases of more than 3 words, as they can make the segment too general. We want to be precise!
3. Avoid duplicate keywords and phrases. Keywords are reduced to their base or root form. If you include “eat” in your list, you do not need to include “eats” or “eating.”