In Copper, we have three levels of access.
Users: They have the ability to add and edit records but not to make any system changes such as customizing fields or pipelines.
Admins: Admins are able to add and edit records and make system changes. Depending on the email settings created by the Account Owner, they may also be able to see more synced emails than users can.
Account Owner: This person has all the options of an Admin, plus the ability to view invoices and make changes to the subscription and billing. Note, there can only be one account owner.
Generally, we recommend having most of your teammates set as Users to prevent unnecessary or confusing changes to your settings.