- The Active Users report
- The Browser & OS report
- The Source/Medium report
- The New vs Returning report
If conversion rates are lower than average for particular browsers or platforms, browse the site with those browsers and platforms. Pay particularly close attention to landing pages, checkout forms and any pages that users must navigate in order to convert. Correct any usability issues you find with these pages.
Learn more here: https://support.google.com/analytics/answer/2659291