
WordPress is free, easy-to-start and powerful CMS.
A live activity across WordPress.com:
CMS usage statistics: WordPress is used on the 32% of the top 1 million web-sites. WordPress CMS market share: 60%.
Stats links:
Links:
Users use WordPress (by the result of surveys in 2013):

WordPress survey in 2014:
- mostly as a cms - 87% in 2014 (was 89% in 2013)
- mostly as a blog - 20% in 2014 (was 26% in 2013)
- mostly as an app platform- 5% in 2014 (was 6% in 2013)
WordPress learning courses:
- http://www.lynda.com
- http://wp101.com
- http://bobwp.com
- http://wpsessions.com
- http://ostraining.com
WordPress awards

My links: