Once you signed up, then it asked to create new workspace where you have to give the workspace name. Workspace is the place where you can share your information and communicate with all the members.
After creating workspace you will be directed into that workspace. By default one who created workspace is owner and manager of that workspace. After creating the workspace there is an option to invite members into workspaces. Owner of the workspace can send invitation links for members to join workspace.
Once you have entered into workspace you can also create multiple workspaces as per your requirement.
How to create multiple workspaces?
Click on the drop down menu in the top left corner.
Then you can see an option to create a new space.
Then you can create workspace and asked to give space name.