Salesforce Lightning Case management

Service Cloud
Used for the Customer service and is built to provide fast and reliable case resolution.
Resolve cases across any channel like Phone, Web, Chat and increase customer satisfaction.

Services/functionality service cloud offers
Case Management
Activities
Contracts and Entitlements
Live Agent/Live Message
Knowledge Management
So and So forth …

Case Management:
Case creation
Tracking of cases
Cases getting assigned to the queue using Case Assignments

Service Console:
Consolidated view of everything at one place.
Console App allows everything to be done from a single screen no need to go to related objects and look for related records with console app it navigate you via tabs in the console app itself

Public Group
Public groups are used to share the information between users, roles, subordinates.
Its a collection of users who have something in common.
Admin can go ahead and create public groups

Queue:
Group of users who owns the record, queue allows group of users who are part of the queue to own the record.

Please find the below video on Service Cloud Case Management, which shows how a case gets assigned to the queue automatically, what is a group , queue, how can we create a lightning console.

Direct You Tube link:

https://youtu.be/6yvzaT6_HM4