I read the 'How does it work?' section and tried a job description and couple of my resumes. I don't fully understand how this tool should be used/or what it is

I read the 'How does it work?' section and tried a job description and couple of my resumes. I don't fully understand how this tool should be used/or what it is telling me about my resume. It gives values for keywords from resume (got it) Then it finds common words between Job Description and Resume I also see another table of values for the job description Now what? Do I need to compare the tables? Do the values need to be within certain range?