is_front_page()
Determines whether the query is for the front page of the site.
WordPress File wp-includes/query.php
is_home()
Determines whether the query is for the blog homepage.
is_main_query()
Determines whether the query is the main query.
is_month()
Determines whether the query is for an existing month archive.
is_page()
Determines whether the query is for an existing single page.
is_paged()
Determines whether the query is for a paged result and not for the first page.
is_post_type_archive()
Determines whether the query is for an existing post type archive page.
is_preview()
Determines whether the query is for a post or page preview.
is_privacy_policy()
Determines whether the query is for the Privacy Policy page.
is_robots()
Is the query for the robots.txt file?