The Insights section gives you a big picture overview of your typeform's performance, and a question by question analysis of drop-off.
This article gives you tips on how to understand your big picture overview. For more information on understanding your question by question data, check out this article.
To view your Insights, just head to the Results panel after opening your typeform:
Big picture insights
The Big picture shows you Views, Starts, Responses, Completion rate and the Average time to complete: