When creating a user you can set a “role” for that user, which gives them different permissions when they login to the WordPress dashboard. Here is a list of the different roles and what they mean:
Administrator: Full access, this user can do anything they want once they’ve logged in.
Editor: Can publish and manage posts, including the posts of other users.
Author: Can publish and manage their own posts only.
Contributor: Can write and manage their own posts, but cannot publish them.