Macros are a feature that can improve productivity for service agents who spend a lot of time on similar cases, such as reset password requests. Macros are tools that allow agents to automate common or repetitive tasks on a record, such as sending an email or updating a field. Macros can help agents save time and avoid errors when working on similar cases. Verified References: :
https://help.salesforce.com/s/articleView?id=sf.console2_macros_overview.htm&type=5 :
https://help.salesforce.com/s/articleView?id=sf.console2_macros_create.htm&type=5

Explanation
Service channels are a required step before configuring Omni-Channel routing. Service channels allow you to define how your organization receives work from various sources, such as cases, chats, leads, orders, or custom objects. You can specify the type, priority, and capacity weight of each service channel, which determines how Omni-Channel routes work items to agents. Verified References: Service Cloud Consultant Certification Guide & Tips, Set Up Service Channels

To assist new agents and enhance productivity, integrating Einstein Next Best Action into the Service Console is recommended. This feature provides agents with contextually relevant suggestions and standardized dialogues based on case details, guiding agents through interactions and ensuring consistent, high-quality customer service.