Show widget only on front page
Use or operator and is_front_page tag.
Show widget on front page only for logged in visitors
Use and operator and is_front_page and is_user_logged_in tags.
Show widget on pages and posts only for admins
Use and operator and is_single and is_user_admin tags.
Show widget on all pages except front page (or pages)
Use not operator and is_front_page tag.
Show widget only on certain page
Use or operator, is_page tag and choose the page you want in tag’s settings.
Show widget on posts that have a certain tag (or tags)
Use or operator, has_tag tag and choose the tag you want in tag’s settings.
Show widget on posts that are in a certain category (or categories)
Use or operator, in_category tag and choose the category you want in tag’s settings.
