Key point
One rule
Pick the chart that makes the comparison easiest for a tired viewer. Your recruiter, judge, or teammate should understand the answer in a few seconds.
Do not start with a chart library gallery. Start with the job your chart must do.
Common chart jobs
Most hackathon dashboards need one of four jobs: compare categories, show change over time, show a relationship, or show exact values.
If your chart does not match the job, the data may be correct but the message will still be weak.