Worpress.com is a blog web hosting service provider owned by automattic. This is a platform provides free blog hosting for registered users and is financially supported via paid upgrades.
Its very easy to use platform, you can just sign in pick up an topic and you can start with creating your own blog, so there is no setup costs or anything like that, you can instantly start blogging.
There are millions of users that use this service so it has great community to learn and grow.
Wordpress also supports free speech and doesn’t shut people down for uncomfortable thoughts and ideas.