@mateuswetah to follow is a suggestions to a basic structure to development this issue.

Title: User Item Groups
Description
Implement a feature that allows any user to create an account on a WordPress site with the Tainacan plugin installed. After creating an account, the user will be able to create item groups using public items already available in Tainacan. These groups can be customized and configured as public or private.

Objective
Increase interaction and personalization within Tainacan, allowing users to group and share items according to their needs or interests, regardless of the items’ original collection. This feature enhances engagement and accessibility of shared content.

Feature Specifications
User Registration:

Allow anyone to create an account on the site by providing an email and password.
Set default permissions for new users focused on creating and viewing groups, without access to Tainacan’s administrative functions (using Tainacan’s default permissions).
Creating Item Groups:

Users can create item groups using public items available in Tainacan.
Each group should include:
Group Name: A required field completed by the user.
Privacy Settings:
Public: Generates a public link that can be shared.
Private: Access restricted only to the group creator.
Managing Items within the Group:

Users can select public items from any available collection in Tainacan, with no collection restrictions, grouping them as desired.
Items will be displayed within the group using Tainacan’s default design.
Public Link for Public Groups:

For groups set as public, a shareable link will be generated, allowing the group to be viewed by anyone with the link.
Expected Behavior
User Experience:

Users should have an intuitive and seamless experience, with an interface and design consistent with Tainacan’s visual standards.
Groups should be easily accessible for creation, editing, and deletion by the user.
Privacy and Security:

Ensure the privacy of items marked as private, allowing access only to the group creator.
Prevent users from accessing private groups created by others.
Additional Requirements
Utilize Tainacan’s existing APIs and structures to maintain compatibility and avoid redundant development.
Basic documentation for end users with usage instructions in the interface.