All Internet and intranet applications' permissions should be required to use our application so that it can be made secure. In SharePoint out of the box, Microsoft has already provided so many permissions to secure our application.
After you have created a SharePoint site, you may want to provide or restrict user access to the site or its contents. For example, you might want to provide access only to members of your team, or you might want to provide access to everyone, but restrict editing for some. The easiest way to work with permissions is to use the default groups and permission levels provided by SharePoint Out Of Box features.
Scope Of Permission Settings
------------------------------- Site Collection -------------------------------------------
----------------------- Sub Sites -----------------------
--------------------Lists-----------
---------- List Items-----
Default Permission Levels
Limited Access
They can view application pages, Browse user information, Use remote interfaces, and Use Client Integration features etc.
Reader
Limited Access permissions plus: View Items, Open Items, View Versions, Create Alerts, Use Self-Service Site Creation, and View Pages.
Contributor
Read permissions plus: Add Items, Edit Items, Delete Items, Delete Versions, Browse Directories, Edit Personal User Information, Manage Personal Views, Add/Remove Personal Web Parts, Update Personal Web Parts.
Design
Contribute permissions plus: Manage Lists, Override Check Out, Approve Items, Add and Customize Pages, Apply Themes and borders, Apply Stylesheets.
Administrator
Has full control of the Website.
Full Control
All permissions
To create a custom permission level
Go to Site Actions -> Site Settings -> Site Permissions (Users and Permissions)
Select "Grant Permissions" (In Ribbon)
Enter the User/Group name. Select Grant user permission directly and check the required permission level.
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Creating Custom Permissions Groups
Go to Site Actions -> Site Settings -> Site Permissions (Users and Permissions).
Click on Permission Levels (In Ribbon).
Add a Permission Level (Menu).
Name = Add or Edit Permission, Check Add Items and Edit Items checkboxes -> Create.
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To Create A Custom Permissions For Lists / Libraries Or ListItems
By default, the permission given to the site automatically applies to the lists as well. We can override these settings and give permissions.
Open List -> Settings -> List Settings -> Permissions for this list.
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SharePoint permissions can depend on other SharePoint permissions. For example, you must be able to open an item to view it. In this way, View Items permission depends on Open permission.
When you select a SharePoint permission that depends on another, SharePoint automatically selects the associated permission. Similarly, when you clear SharePoint permission, SharePoint automatically clears any SharePoint permission that depends on it. For example, when you clear View Items, SharePoint automatically clears Managed Lists (you can't manage a list if you can't view an item).