Visio App has got a BPMN stencil under the flow chart category since Visio 2013.
Seqeunce flows BPMN are default flows and conditional flows. This video explains to you the usage of the sequence flow in a BPMN model through a Visio Practical

Few Points to Remember about BPMN

1. BPMN is the popular and most extensive notation set to model business processes
2. BPMN elements are Flow Objects, Connecting Objects, Data, SwimaLand and Artefacta
3. BPMN was pioneered by BPMI now BPMN is an OMG (Object Management Group ) Standard
4. Pega, IBM Modeller, Bizagi Modeller , Oracle BPM Suite are popular and specialist and powerful BPM Softwares
5. Visio which is a general purpose modelling software is used by many Business Analyst to prepare BPMN models.

To insert a new page in Microsoft Visio, go to Insert ribbon, Pages Group and  “New Page” as shown in  Picture 1, shown below

Now click on the New Page icon. If you click on the New Page Icon a new blank page ( Visio foreground page) will be inserted.
How ever if you click on the small black triangle present in the bottom right corner it will ask you to Insert either  a

1. A Blank Page
2. A Background Page
3. Duplicate Page (Duplicate of currently selected Page will be inserted)

Shapes in a Visio drawing can be placed over one another. The relative position (z-order) of shapes  stacked over one another can be changed by utilizing Bring to Front / Bring Forward and Send to Back / Send Backward features.  There may be problems while editing if a shape that is being covered by another; thus this Visio feature Bring to Front and Send to Back ease out the issue of editing of overlapping shapes. 
This feature is available at “Home” Tab in “Arrange” group. See Picture 1 of Visio Ribbon, Shown below
​ 

​
​Bring to front
This feature brings the selected shape on the top of the stack. The feature is available on the Home tab in the Arrange group. Select the shape, click on  (In picture 2 we selected the green triangle, on the left)  Bring to Front. After clicking on Bring to Front the Green Triangle shape comes on the top. See Picture 2 below.

​
Bring Forward ​
Bring Forward Feature Brings the selected shape one step closer to the front: This feature is available on the On the Home tab in the Arrange group, Select the shape (we selected Green Triangle shape as shown below) click the arrow next to or under Bring to Front, and then click Bring Forward.
You can notice that the selected Green Triangle shape which was at the bottom of the shape stack, came over the 

​
Send to Back
Sends the selected Shape to the  bottom  of the stack:  This feature is available On the Home tab in the Arrange group. Select the shape , click on Send to Back. icon​. Here we selected Blue triangle shape and clicked on send to Back. See picture 4 below
​

​
Send Backward
Send a shape one level below on the stacking order: Here we selected the blue ellipse and clicked on Send to Back . You can see in Picture 5, shown below that the blue ellipse shape went behind the green triangle shape after the operation was performed

​Let’s find change shape feature in Microsoft Visio?
Microsoft Visio introduced “Change Shape” feature in Visio 2013 edition which allows you to change the selected shape in the drawing to another related shape. It is available in the “Editing” group of “Home” ribbon as shown in the image shown

​Key Benefit:
Prior to the availability of change shape feature, in the drawing to change the shape you need to delete the existing shape and insert the new shape. But post availability of change shape feature you can change the shape on just single click and no need to waste your time in deleting the shape and inserting the new shape.

​How to use change shape feature in Microsoft Visio Templates?
Follow the below steps to use change shape feature in your working visio template:
​

Visio is number one general purpose diagramming and modelling software. Like other software from its parent company Microsoft it is easy to use yet 

With this launch, as on October / November 2018,  Vision 19 Professional and Visio 19 Standard editions will have same features as Visio Online Plan I and Visio  Online Plan II respectively.

• New Wireframe-Mobile App and Wireframe-Website Templates Traditionally Visio lagged in functionality vis a vis popular wireframe and mockup production software like Balsamiq. With the introduction of below shown templates Wireframe - Mobile App and Wireframe-Website, Visio has done a good job. Going forward it has powerful templates and features for wireframe and mockup preparation. These templates are present in the software and database category.

​

Find below a sample quiz on Microsoft Visio. This quiz draws features and functionalities of Visio Standard 16, Visio Professional 16, Visio for Office 365 Plan I and Visio or Office 365 Plan II features.

This post, which is a visual highlights various features / various icons available in the Visio Diagram Page

Comments in a Visio diagram are either attached to shape or attached to Visio diagramming page.

Comments in a Visio drawing can be 
1) Attached to a Visio page. If we add any comment to a Visio drawing without selecting any shape, the comment gets attached to a Visio Page.
2) If we select a shape and then add a comment to the Visio drwaing it gets attached to a page