1. The different colors provide simple visual aids to help you identify metric strength. For example, the colors are divided into the types of data they represent.
- URL Metrics - Green
- On-Page Optimization - Blue
- Domain Name-KW Match - Yellow
- URL Anchor Text Metrics - Purple
- Domain Wide Link Metrics - Red
- Social Signals - Green (again)
Within each metric, darker colors indicate which URL has achieved the highest level within each category - the "winner" of the metric, so to speak.
The best way to use this tool is using it to see how the top positions are winning, and compare yourself to them. Perhaps you are winning on social signals, but need better on-page optimization. There's no right answer, but the tool provides a wealth of information to see how you compare to the competition, how they are succeeding, and what you can do to improve.
2. The Term Extractor, unfortunately, can be a little temperamental. This is a known issue and our engineers have plans to improve this feature down the line. This is a really helpful tool when fully functional, and it still provides pretty good results for most users.
Hope this helps! Best of luck with your SEO.