"Plans" is where you find access to the plans, and the groups, lessons, and study content under a plan.
A "Plan" is like a private course you can populate with courses, groups, lessons, study content, and individual study items. Plans are created or populated
via "Add to plan" links found on many pages.
About "Search"
The "Search" page is for doing a text search starting from the current item, be it the courses list, a course, a group, a lesson, or a lesson content item.
Various options let you refine what is searched, and how text is matched.