This ability allows you to post questions, articles, and answers without limit, as well as being able to vote and leave comments on any post. You can see guidance on asking questions and how to vote in the Help Center.
To earn this ability, you need to have roughly 75% of your posts be positively received, with a minimum of 5 positively-received posts (these numbers may vary from site to site).
If a site is in "new site" mode, all users start with this ability.