How do I create a view of Nodes that a logged in user is a member of? Is this enforced in Relationships or Contextual Filters? That is, can you explain how group membership is enforced via relationships and contextual filters?
Organic Groups are providing a set a views already configured and ready to use. What you are looking for is one of these views, specifically this view:
OG User groups of
Type: OG membership.
You may create a clone of this view (is a good practice to keep the original view intact, mainly for reference) under
admin/structure/views and set it (fields, filters etc) according to your needs. You may also explore the
contextual filters and see how are set. Note that the type is OG membership. A handy thing to add to your view is the
(un) subscribe link from/to group. This is found in fields as:
Content: Group with formatter '
OG subscribe link' .
Lastly, keep in mind that the OG's:
OG User groups view is a
content pane , not a
page. This means that if you want to place your group's
page under a menu you'll have to create a
view page with a path.
Hope that helps!