Forum Discussion
Understanding Site Hierarchy and Permissions
If you have ever been confused with site collections and hierarchies for permission levels then this is a great reference page. https://learn.microsoft.com/en-us/sharepoint/understanding-permission-...
Just be aware that Microsoft recommends not to use subsites now but to have a flat structure with a hub site that has sites associated to it.
Rob
Los Gallardos
Microsoft Power Automate Community Super User.
Principal Consultant, SharePoint and Power Platform WSP Global (and classic 1967 Morris Traveller driver)