All users have the privilege to comment on an answer starting with 1 reputation. You have the ability to create posts:
Create Posts
Privilege Type: Creation Privilege Awarded At: 1 Reputation
What is asking and answering questions? The most basic privilege of all -- the right to ask a question, and the right to contribute an answer. This is generally available to everyone, regardless of reputation level.
This is available on the privileges page here: https://superuser.com/help/privileges/create-posts
