Excellent Response Tech Aspect and Arun!

Also when you use HELPX articles - please refer to the version.One of the issues you have is you are trying to use an article meant for AEM 5.5 on 6.4. See below. Always match the article version with the AEM version.

In AEM 6.x - never use CRXDE lite to create OSGi bundles. Always use a Maven Archetype.Creating an Adobe Experience Manager 6.4 Project using Adobe Maven Archetype 13Also - as you are new to AEM -- see Getting Started with AEM-SitesPlease start with this article too -- Getting Started with AEM Sites...

You are having an issue at placing an Experience Fragment in a page that is based on an editable template? 

Try on a fresh instance. Also try this artilce to create a custom log - Creating a custom log file for an Adobe Experience Manager project

For AEM 6.3 - try using DS Annotations.

Watch this that shows how to properly drag and drop components defined in a policy onto a page:

I have never tried this use case - i have asked some other internal ppl to look here.

See this Guided Journey - we show how to set up the Layout container and then define a policy that sets components for it and then drag components on the page that is based on the editable template. Scott's Digital Community: Guided Journey for Experience Manager on Editable Templates

You cannot extend editbale templates. Look at We Retail - it contains many editable Templates for different page types. That reflects best practice when working with editable templates. You can create an many as needed - but you cannot extend them.