Step 1: Navigate to Appearance–> Sidebar Generator and click the Add New button, enter sidebar title then save. You can add as many sidebars as you need.
Step 2: Once you are done, you need to add Widgets to the sidebar you just created.
Step 3: Navigate to Appearance–> Widgets and find your sidebar on the right side.
Step 4: On the left hand side you will see all the widgets you can use, simply drag and drop the widget you want into your sidebar on the right hand site.
Step 5: Make sure you click Save to save the widgets added to your sidebar

You can add any widget and any number of widgets to your sidebar. All widgets are accessible from Appearance–>Widgets and easily dragged and dropped to your sidebar.
Step 1: Navigate to Appearance–> Widgets to access the list of widgets and widget section that they can be added. The left hand side shows all the widgets you can use. The right hand side shows all different sections you can add widgets to.
Step 2: Simply drag and drop the widget you want into the widgets section you want the right hand side.
Step 3: Don’t forget to click save changes after you customize any widget in sidebar.

The image above reveals 3 sidebars which are Department Sidebar, Main Sidebar and Doctor Sidebar

This sidebar is shown on Department Page

Drag Noo Apartment and 2 Text widgets to Department Sidebar> click the triangle icon on the right side of the widgets> Complete options of Noo Apartment: Title (Enter a title) and number of posts to show ( a number entered here is equal to the number of posts will be shown)> Save

This sidebar is shown on Blog Page

Drag Search, Latest Posts, Categories, Tag Cloud, Recent Tweets to this sidebar> click on the triangle icon on the right side of these widgets> complete options> Save.

This sidebar is shown on Doctor Page
Drag widgets like Noo Doctor Categories and Text widgets to this sidebar> click the triangle icon on the right side of these widgets> complete options> Save