With Knowledge Sharing Block one can separate a sub-tree of categories and courses as resource/activity storage for all the site. The first step is to select on the settings page the category that will act as root. After that, when one editing a course section, the Knowledge Sharing Block will show on the top-left side of the page showing all the resources/activities under that category. Those resources/activities can be organized in tree by the category/course flow or using tags that assigned to them. The desired resource/activity can be dragged to the section of the course and shared easily. 

Important

This block will automatically add itself upon installation to the course-view page when in ediitng mode. The block will be on top of the other blocks on the left pane... It is done to make this block more easily accessible...