A project is a container that normally maps to a company project or product. There is no pre-set limit how many projects you can create.
For example, you might create a project for your accounting system, or a project for your software product.
Projects contain server groups, which are containers for servers. Although a server group might only contain a single server, there's never a need to deal with individual servers after they've been added to a server group.
To create a project, simply choose Create Project. You can name it anything you like and change it at any time.
Next step, Create Server Groups.