How to set up a 301 redirect from an internal page to the main page?

Question

Search Engine Optimization

Hello. How to set up a custom 301 redirect from site.ru/main to site.ru

Answer 1

Rules for configuring the .htaccess file for a 301 redirect:
At the same time, the new address must be specified in full with http or https and a domain name

Answer 2

function action_function_name_11() {
  // Проверки и прочее
wp_safe_redirect( $location, 301);

}
add_action( 'template_redirect', 'action_function_name_11' );

https://wp-kama.ru/hook/template_redirect
https://codex.wordpress.org/Function_Reference/wp_...