How many custom reports are offered by Google Analytics?

There are the following 12 custom reports created and offered by Google Analytics experts:

1. Browser report.
2. Visitor acquisition efficiency analysis report.
3. Customer behaviour report.
4. Mobile performance report.
5. Page timing report.
6. Hours and days report.
7. Site Diagnostics: Referring sites report.
8. Content efficiency report.
9. Traffic acquisition from a social media report.
10. SEO referring pages report.
11. SEO insights for organic Google report.
12. Keyword analysis report.