The following are 5 good sites in regard to SharePoint information architecture:
Introduction to SharePoint Information Architecture:
https://learn.microsoft.com/en-us/sharepoint/information-architecture-modern-experience
Information Management and Governance in SharePoint:
Information Architecture in Modern SharePoint:
https://learn.microsoft.com/en-us/sharepoint/information-architecture-principles
Information Architecture Models and Examples:
https://learn.microsoft.com/en-us/sharepoint/information-architecture-models-examples
Information Architecture Guidance for SharePoint Online Portals:
https://learn.microsoft.com/en-us/sharepoint/dev/solution-guidance/portal-information-architecture
