Nodes are an important part of OS.Core, and understanding the terminology will help you understand the overall approach to setting up.
A Node is a conceptual container for your resources. It could be your brand name, or the address of a property, or any type of legal entity.
All users will land on a page with their node already set up following an easy to use wizard, from here you can change various details to get things just right.
Each user can have multiple Nodes. Nodes come in different tiers. A Universal Node only get one node, but Pro and Enterprise users can go through the wizard flow again when creating subsequent nodes.