Theme Files (include)
<?php get_header(); ?> ------------header.php.
<?php get_template_part('file'); ?> ----------file.php.
<?php get_search_form(); ?> ----------Search form searchform.php.
<?php comments_template(); ?> ----------Comments form comments.php.
<?php get_sidebar(); ?> ----------sidebar.php.
<?php get_footer(); ?> ----------footer.php.
get_template_directory() ----------The path to the parent theme (not child). No trailing /.
get_stylesheet_directory() ----------Theme Path (where parent/child style.css). No trailing /.
get_parent_theme_file_path() ----------File path of parent theme (not child).
get_theme_file_path() ----------File path of parent/child theme.
load_template() ----------Includes file (require_once).
locate_template() ----------Finds/Includes parent/child theme file.
get_template_directory_uri() ----------URL of parent theme (not child). No trailing /.
get_stylesheet_directory_uri() ----------Theme URL (child theme if it exists). No trailing /.
get_theme_root_uri() ----------URL of the theme's DIR. No trailing /.
get_stylesheet_uri() ----------URL of the theme's style.css file.
get_theme_file_uri() ----------URL of the parent/child theme file.
get_parent_theme_file_uri() ----------URL of the parent theme file.
