As an administrator or owner of a library, list, or survey, you can change permissions to let the right people access the data they need data while restricting others.
By default, all sites, lists, and libraries in a site collection inherit permissions settings from the site that is directly above them in the site hierarchy. This means a site inherits permissions from the root site of the site collection, and a sub site inherits permissions from its parent site. Folders, lists and documents inherit permissions from the site that contains them, and so on.
To assign unique permissions to a list, library, or survey, you have to first break permissions inheritance, then assign unique permissions. You can do all of this on the Permissions page. This article shows you how to get to the Permissions page and break inheritance, and then provides the steps to assign or change permissions.
Note: When a user shares a document or other individual item, inheritance is automatically broken for that item. Inherited permissions are copied to the item, and permissions for the users with whom the item was shared are added. But if changes in permissions are made to the parent item, those changes are not be applied to the item.
Contribute was the standard permission level for users in the Members group of a site in SharePoint 2010 and earlier. This gave them the ability to add, edit and delete items contained within the existing libraries of the site. In SharePoint 2013 a new default permission level was added for the Members group, Edit. In addition to the capabilities granted by the Contribute permission level Edit also gives users the additional abilities to edit and delete existing, plus create new, lists. Because this permission level is given to all users assigned to the Members group by default, it gives your average user the ability to do a lot of damage to your SharePoint environment, such as by deleting entire lists of documents, either maliciously or by accident. The list permissions available the two levels is illustrated in the table below.
|Override List Behaviours||NO||NO|
|View Application Pages||YES||YES|
The key difference here is the “Manage Lists” permission which by itself grants users the power to “Create and delete lists, add or remove columns in a list, and add or remove public views of a list”.
As a result of this it is recommended that when you create a new site you should change the permission level of the Members user group to Contribute, unless there is a need for the users of that site to be able to alter and create lists. Or better still, as a general rule, give users the lowest permission level required for them to do their jobs. More detailed information on SharePoint permissions can be found here: https://lightningtools.com/permissions/sharepoint-permissions/