To summarize all the things that you learned in the last 9 chapters:

1. Visio is a Microsoft Office Tool that can be used to create various kinds of diagrams like Sales Charts, Process Flows, Layouts, Engineering Diagrams, Software Diagrams and Blueprints.
2. Visio has three main components, Stencils, The Drawing Page and Connectors. You can create all Visio Diagrams using these three components.
3. You can create different kinds of drawings using Visio. Some of these include Block Diagrams, Flow Charts, UML Diagrams etc.
4. Stencils are a collection of shapes. Each Type of Drawing comes with one or more stencils of its own which is opened in the left pane whenever the corresponding drawing is being created in the Drawing Page.
5. You can create Custom Stencils from existing Shapes or from Custom Shapes.
6. A drawing involves dragging shapes to the drawing page, adding text to the shapes and connecting them using the connectors provided.
7. You can completely customize the shapes by resizing them, customizing the line weight around them and changing their fill color and pattern.
8. You can also Rotate , Copy and Move Shapes on the Drawing Page.
9. Text can be added to Shapes using the text tool on the toolbar or by doubleclicking the shape and typing in the text. Text can also be rotated to fit inside the shape.
10. Connectors can be glued on to the connection points on shapes to retain the connections even when you move the shapes around.
11. You can use templates provided by Visio for your drawings or you can create templates of your own.
12. You can distribute Visio Diagrams through email or in Printed format.

In short Visio is a a user friendly tool that provides you with an effective way to create professional and impressive diagrams with minimal effort.