Explanation
On-Demand Email-to-Case and Web-to-Case forms are features that a consultant should suggest to reduce the amount of time support agents spend creating cases. Case creation must scale up to 5000 new cases per day, as well as allowing file attachments under 25 MB by the customer. These features can help automate the case creation process from email or web sources, as well as support file attachments. For example:
On-Demand Email-to-Case is a feature that allows you to convert customer emails into cases without installing an agent in your network. On-Demand Email-to-Case can handle up to 5000 new cases per day, and can also accept file attachments up to 25 MB in size. On-Demand Email-to-Case can help reduce the manual work of creating cases from emails, as well as preserve the email formatting and headers.
Web-to-Case forms are forms that you can embed on your website to allow customers to submit cases directly to Salesforce. Web-to-Case forms can handle up to 5000 new cases per day, and can also accept file attachments up to 25 MB in size. Web-to-Case forms can help capture customer information and issues from your website, as well as reduce the email and phone traffic to your support team.
Verified References: Service Cloud Consultant Certification Guide & Tips, Set Up On-Demand Email-to-Case, [Set Up Web-to-Case]

Explanation
Publisher actions, macros, and quick text are Salesforce productivity features that can help reduce the clicks a customer support agent uses when working on a case. Publisher actions are buttons that let you create records or perform tasks from the feed or record page. Macros are sets of instructions that tell Salesforce how to update fields, send emails, and perform other tasks on a case. Quick text are reusable messages that you can insert into emails, chats, tasks, events, and more. Verified References: Sales Cloud Productivity Best Practices