You may go through the following terminology in order to understand this documentation better. It will bring you on the same ground with us to understand rtBiz in a proper way.
Organisation- The company which is using rtBiz.
Employee- Member of the organisation, which is using rtBiz
Products- Products and services offered by the organisation.
Departments- Working units of the organisation.
Contact- Core entity of rtBiz. Represents a individual, client, vendor, customer, company employee.
Company- Represents an enterprise, firm. It basically a group to which a cluster of contacts belong to. Contacts under a Company represents that they are part/employee of that company.
ACL- Access Control Lists
Assignee- Organisation's 'Employee' (WordPress user) to which a contact/company is assigned to.
Attributes- Attributes are used to add dynamic taxonomies to WordPress post types. They can be used to further categorize and group the posts conveniently.
WordPress User- A user which has an account on organisation's WordPress.
Contact Group- Group to which contact belongs. The groups are Customer, Employee, Vendor.
Customer- Organisation's client/customer.
Employee- Organisation's employee.
Vendor- Organisation's Vendor.
Entity- Contact, Company, Ticket, Lead, Asset, Bundle etc.
Profile Level Settings- Settings available for a