How to get all post by categories in wordpress?

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function get_posts_by_category($category_name) {
    // Get the category ID from the name
    $category = get_category_by_slug($category_name);
    $category_id = $category->term_id;

    // Setup the arguments for the query
    $args = array(
        'post_type' => 'post', // Select the post type (default is 'post')
        'category__in' => array($category_id), // Select the category ID
        'posts_per_page' => -1,  // Show all posts of the category
    );

    // Perform the query
    $posts = get_posts($args);

    // Loop through each post
    foreach ($posts as $post) {
        // Output the post title, content, or any other data you need
        echo '<h2>' . get_the_title($post) . '</h2>';
        echo '<p>' . get_the_content($post) . '</p>';
    }
}