Custom menu page with settings section and field

custom-menu-settings-page.php

<?php
/**
 * Class Admin.
 */
class Admin {

	/**
	 * Admin settings array.
	 *
	 * @var array
	 */
	private $admin_settings;

	/**
	 * Constructor.
	 */
	public function __construct() {

		$this->admin_settings = get_option( 'admin-menu-settings' );

		/**
		 * Actions.
		 */
		add_action( 'admin_menu', [ $this, 'add_admin_menu' ] ); // To register custom menu setting.
		add_action( 'admin_init', [ $this, 'add_admin_menu_init' ] ); // To register setting sections and fields for custom menu.
	}

	/**
	 * To add Admin Menu tabs.
	 *
	 * @return void
	 */
	public function add_admin_menu() {

		// This will create menu tab in admin sidebar and its page layout called from admin_menu_html callback function.
		add_menu_page(
			__( 'Admin Menu Settings', 'default' ),
			__( 'Admin Menu', 'default' ),
			'manage_options',
			'admin-menu',
			[ $this, 'admin_menu_html' ]
		);
	}

	/**
	 * Admin Menu setting page html.
	 *
	 * @return void
	 */
	public function admin_menu_html() {

		// User Require Capability to edit page.
		if ( ! current_user_can( 'manage_options' ) ) {
			wp_die( esc_html__( 'You do not have sufficient permissions to access this page.', 'default' ) );
		}
		?>
		<div class="wrap">
			<h1>
				<?php echo esc_html( get_admin_page_title() ); ?>
			</h1>
			<form method="post" action="options.php">
				<?php
				settings_fields( 'admin-menu' );
				do_settings_sections( 'admin-menu-page' );
				submit_button();
				?>
			</form>
		</div>
		<?php
	}

	/**
	 * Undocumented function
	 *
	 * @return void
	 */
	public function add_admin_menu_init() {

		register_setting(
			'admin-menu',
			'admin-menu-settings'
		);

		add_settings_section(
			'admin-menu-general-settings',
			__( 'Global Settings', 'default' ),
			'__return_empty_string',
			'admin-menu-page'
		);

		add_settings_field(
			'text-field',
			__( 'Text Field', 'default' ),
			[ $this, 'get_text_field' ],
			'admin-menu-page',
			'admin-menu-general-settings'
		);

		add_settings_field(
			'checkbox-field',
			__( 'Checkbox Field', 'default' ),
			[ $this, 'get_checkbox_field' ],
			'admin-menu-page',
			'admin-menu-general-settings' // Section name.
		);
	}

	/**
	 * Prints checkbox field.
	 *
	 * @return void
	 */
	public function get_checkbox_field() {
		echo sprintf( '<input name="admin-menu-settings[checkbox-field]" type="checkbox" id="checkbox-field" value="1" %s>', checked( $this->admin_settings['checkbox-field'], '1', false ) );
	}

	/**
	 * Prints text field.
	 *
	 * @return void
	 */
	public function get_text_field() {
		echo sprintf( '<input name="admin-menu-settings[text-field]" type="text" id="text-field" value="%s" class="regular-text">', esc_attr( $this->admin_settings['text-field'] ) );
	}
}