wp-config.php holds essential database connection details, security keys, and other configuration settings for your WordPress installation.

wp_posts (posts, pages), wp_users (user data), wp_options (settings), wp_terms (categories, tags), wp_term_taxonomy (relationship between terms and taxonomies), etc.

get_template_directory() points to the parent theme's directory, while get_stylesheet_directory() points to the active theme's directory (child theme or parent).

The template hierarchy determines which template file WordPress uses to display a page based on the requested URL.

Create a PHP file with a Template Name comment, and then select it from the page editor.

Hooks (actions and filters) allow you to modify or extend WordPress functionality. Actions perform tasks, while filters modify data.

Create a PHP file with plugin header comments and place it in the wp-content/plugins directory.

Use the register_post_type() function.

Use the register_taxonomy() function.

Use wp_enqueue_script() and wp_enqueue_style() functions.