A roll-up summary field is a field on the parent object that calculates the sum, average, min, or max of a field on the child records. It can be used to learn the sum of the amount for each opportunity related to an account.

Explanation
The most benefit that GCC would get by moving to the Salesforce Platform is that it provides a complete view of a company's customers on one unified platform. This means that GCC can access and manage all the data and processes related to its marketing, sales, commerce, service, and IT departments from one place, without having to switch between different systems or platforms. This also enables GCC to have a 360-degree view of its customers, which helps it deliver personalized and consistent experiences across all touchpoints.

The Trailblazer Community is the resource that the Salesforce associate should use to post a question that anyone around the globe who is familiar with Salesforce can answer. The Trailblazer Community is an online platform where Salesforce users, partners, employees, and experts can connect, collaborate, and learn from each other. The Trailblazer Community allows the user to ask questions, join groups, share ideas, access resources, and earn badges. Trailhead Academy is a resource that provides training courses, certifications, and learning paths for Salesforce users who want to enhance their skills and knowledge. Salesforce Help is a resource that provides documentation, guides, videos, and support for Salesforce users who need assistance with using or troubleshooting Salesforce products and features.

Explanation
One feature of multi-tenant architecture is that resources are shared but tenants cannot claim each other's resources. Multi-tenant architecture means that multiple customers (tenants) share the same hardware, software, and infrastructure resources, but their data and configurations are isolated and secure. This allows Salesforce to deliver high performance, scalability, and availability to its customers