Insert hyper-links to existing wiki pages using the "Page>>Insert tab>>From Address"

I am working on an enterprise wiki site collection, and when I want to add links to existing wiki pages I find multiple approaches for achieving this:-

• Using the double brackets [[WikiPageName]]
• Using the “Insert tab>>chose link>>from sharepoint”
• Using the “Insert tab>>chose Link>>from address”

I find that using the double brackets approach is fast but the link name must be equal to the wiki page name, although this is valid for most cases, but if the user want to have the link name different from the wiki page name then he cannot use the [[]] approach. Second approach will be to use the “link>>from address” and type the full URL for the wiki page as follow:-

Then SharePoint will automatically know that the link reference a wiki page inside the site collection and will automatically update the link address in case the destination wiki page url changed. So my question is basically about using the “Link>>from address” approach, as most of our users use it, they simple edit the wiki page, then click on “Inset” tab>>click on Link>>”From Address”, they type the full page url such as http://servername:portnumber/sites/wiki/pages/test.aspx. I have mainly the following question about the above approach:-

1. Is using the “Insert>>link>>From Address” to reference existing wiki pages a valid approach?

2. I have noticed that SharePoint will automatically trim the servername:portnumber from the URL , so how did SP know that the url I provide is within the sharepoint site collection and not within external web application. Because it will trim the servername and port number from the URL which I provide, and also will automatically update the link URL if the destination wiki page url changed.

3. What are the main differences between using “Link>>From SharePoint” & “Link>>From Address” approaches ?