[wp_user] shortcode for display login, registration, forgot password form.
[wp_user_member] shortcode for display member list/directory
[wp_user_list] shortcode for display member list/directory
[wp_user_restrict] your restricted content goes here [/wp_user_restrict] shortcode for Restrict Content to registered users only. logged in users only access content
To restrict just a section of content within a post or page, you may use above shortcodes