Great question! In your Analytics, there is a section about your keywords and their performance.
The words that are in green are words that are your "existing keywords in content", which means that those are words you added to your Key Messaging section of your dashboard that you have included in your content (thats great!).
Words in red are "Existing Keywords Not in Content", which means that you have added those keywords to your Key Messaging, but are not using them in your content.
Suggested Keywords, the words in blue, are words that you are using frequently but have not added to your Key Messaging - so you might want to consider adding them and using them to your advantage!