# Navigation BzCtrl. is organized around **Domains** and **Workspaces**, which you can select from the **Navigation Tree** in the top-right corner of the tool. Understanding this structure is key to using BzCtrl. efficiently.
![editor_17_5_4b8d2522-74ce-4dbe-b21e-b0694fc082b4_rte_image_18.png](https://www.bzctrl.com/bzctrl-core-api/api/v1/download/editor_17_5_4b8d2522-74ce-4dbe-b21e-b0694fc082b4_rte_image_18.png)
#### #### Domains - **Purpose:** Domains are used to structure and organize Workspaces. They help you **group** related areas of your business **and control how data is shared.** - **Hierarchy:** Domains can contain **sub-Domains** and **Workspaces**. If a parent Domain contains multiple sub-Domains, all data from the sub-Domains and their Workspaces is visible at the parent level. This creates a clear hierarchical structure. - **Role Management:** Domains are also used to assign user roles, controlling who can access and modify data. #### Workspaces - **Purpose:** Workspaces are where the actual **To-do’s** are recorded and managed. - **Relation to Domains:** Each Workspace belongs to a Domain, and data can be shared across Workspaces belonging to the same Domain. #### Pages - Located on the **left-hand side** of the interface, Pages display data based on your current selection in the Navigation Tree. Selecting a Domain or Workspace in the tree determines which data is visible.
![editor_17_5_78255d22-1923-4570-a40e-b26eb74fa02d_rte_image_55.png](https://www.bzctrl.com/bzctrl-core-api/api/v1/download/editor_17_5_78255d22-1923-4570-a40e-b26eb74fa02d_rte_image_55.png)
#### Quick Overview 1. **Navigation Tree (top-right):** Select Domains or Workspaces. 2. **Domains:** Structure your Workspaces, group and share data, assign roles, and create hierarchy. 3. **Workspaces:** Record and manage your To-do’s. 4. **Pages (left):** View the data related to the currently selected Domain or Workspace.