Link to edit a course

In Moodle 3, the editing of a course is possible if one is a teacher or with other editing rights.

The URL to directly edit a known course uses the commands update&return=1.

In the following examples, the course ID is 100

Open the course page
course/view.php?id=100

and to open the page as in editing
course/modedit.php?update=100&return=1

Any page that is already having an edit session 
mod/page/view.php?id=100&notifyeditingon=1

This is introduction should help with understanding the framework.