What are Users? What roles do they play on my website? How much access do they have?
The standard User roles WordPress uses are based on how much access you want the user to have:
The Administrator has the highest access of the site users and is able to use all enabled site features, while a subscriber has the lowest, only able to read and write comments (for more information check out the comparison charts below).
You need to consider carefully what role you assign all users because on group sites Administrators are able to remove other users, including other administrators, and editors can delete content.
Summary of user roles based on their Capability:
Summary of differences between users based on access to dashboard menus: