How to make a sidebar in wordpress?

Question

WordPress

Hello, I have a problem rather than a question, I included a sidebar in the functions.php file

add_action( 'widgets_init', 'register_my_widgets' );
function register_my_widgets(){
  register_sidebar( array(
    'name'          => "Left Sidebar",
    'id'            => "left_sideBar",
    'description'   => 'Описание сайт бара'
  ) );
}

added php code in sidebar.php file in wordpress in appearance section widget subsection appeared BUT when i insert a widget ( any ), it is not saved and displayed on the site ( moved to "Inactive Widgets" section), what should i do please help PS I’m not sure if this is important or not, but I didn’t install any plugins, the wordPress version is like 4.9.1 if I remember correctly, there is 5.4.1, I tried it on it, too. Thanks
<?php dynamic_sidebar('left_sideBar'); ?>

Answer 1

SideBar is connected in the WordPress admin panel (Themes --> Customize --> Widgets --> Add SideBar)
This is different for each theme, so you should look at the documentation for your theme on this topic