1.Wordpress is totally free and Open-Source.You can also try it on local computer.
2.Wordpress is easy to use.there are several tutorials and articles about WordPress on web.
3.Wordpress is easy to customize and SEO friendly.Google robots search better WordPress than other CMS.
4.Create various websites on WordPress.like:
D.Service/Appointment Booking Website
E.Question Answer Forum
5. Is Easily Integrated With Any Service/Application.