Explanation
The Knowledge component is a Lightning component that displays relevant articles on the case record page based on the case information. Agents can use the component to search for articles, attach articles to cases, view article details, and provide feedback on articles. The Knowledge component helps agents find the information they need to resolve cases faster and more accurately. Verified References: Service Cloud Consultant Certification Guide & Tips, Use the Lightning Knowledge Component

Explanation
Appointment Assistant is a feature that can improve the customer experience by reducing the 4-hour long appointment windows and providing information about the technician's arrival time. Appointment Assistant is a feature that allows customers to track the status and location of their service appointments in real time through SMS messages or a web page. Appointment Assistant can help customers plan their day, reduce no-shows, and increase satisfaction. Verified References: :
https://help.salesforce.com/s/articleView?id=sf.field_service_appointment_assistant_overview.htm&type=5 :
https://help.salesforce.com/s/articleView?id=sf.field_service_appointment_assistant_setup.htm&type=5