https://www.salesforce.com/products/service-cloud/self-service-portal/

A Salesforce-recommended governance structure for nonprofit organizations ensures the implementation runs smoothly and effectively. It typically includes the following elements:
Release Management: This ensures that changes are systematically planned, tested, and deployed. It involves managing how new features and updates are rolled out to avoid disruption and ensure smooth transitions.
Rules of Engagement: These define how different stakeholders will interact with the system and with each other. It includes protocols and guidelines for communication, decision-making, and responsibilities.
Center of Excellence (CoE): This is a dedicated team or a hub of experts that provides leadership, best practices, research, support, and training. A CoE helps ensure that the organization is leveraging Salesforce effectively and efficiently.
Reference:
Salesforce Nonprofit Cloud Implementation Guide
Salesforce Trailhead: Governance Framework

To ensure that donors receive credit for new donations, the automatic Opportunity Contact Role hard credit value should be configured in NPSP Settings. Here's how to do it:
Navigate to NPSP Settings:
Go to the App Launcher and search for "NPSP Settings".
Access Donations Settings:
Under NPSP Settings, select "Donations".
Click on "Opportunity Contact Roles".
Configure Default Contact Role:
Set the default Contact Role for Opportunities to ensure that the primary donor is automatically assigned the correct role.
This role typically is "Primary Donor" or "Donor".
Verify and Save:
Ensure that the configuration is correct and save the changes.
This setup ensures that when new donations are imported or entered, the primary donor receives the appropriate hard credit automatically, maintaining accurate donor credit records.
Reference:
Salesforce NPSP Documentation: Opportunity Contact Roles
Salesforce Trailhead: Manage Donations in NPSP