This is an example of developing a plugin. to read more: https://peter-chang.medium.com/3-wordpress-hook-mechanism-and-principle-filter-ad8b079e37e8

dev-plugin.php

<?php
/**
 * @package Dev-Plugin
 * @version 1.7.2
 */
/*
Plugin Name: Dev Plugin
Plugin URI: http://wordpress.org/plugins/hello-dolly/
Description: This is not just a plugin, it symbolizes the hope and enthusiasm of an entire generation summed up in two words sung most famously by Louis Armstrong: Hello, Dolly. When activated you will randomly see a lyric from <cite>Hello, Dolly</cite> in the upper right of your admin screen on every page.
Author: Matt Mullenweg
Version: 1.7.2
Author URI: http://ma.tt/
*/


function adminMenuHandler() {
	global $team_page;
	add_menu_page( __( 'Teams', 'sports-bench' ), __( 'Teams', 'sports-bench' ), 'edit_posts', 'add_data', 'adminMenuPageHandler', 'dashicons-groups', 6 ) ;
}		   
function adminMenuPageHandler() {
	settings_errors();
	echo('<h1> Team Setting </h1>
	<p> This is an example section of giving the information below, then save them into DB - option.</p>
	<div>
		<form method="post" action="options.php">
			<label>Team Email: </label><input type="text" name="my_option_email" value="'.get_option('my_option_email').' " /><br />
			<label>Team City: </label><input type="text" name="id_number" value="'.get_option('id_number').' " /><br />
			<label>Team State: </label><input type="text" name="option_etc" value="'.get_option('option_etc').' " /><br />');
	
			settings_fields('my_option_group');
			do_settings_sections('my_option_group');
			submit_button();
	echo('	</form>
	</div>');

}
add_action( 'admin_menu', 'adminMenuHandler' );	

function register_mysettings() { // whitelist options  
	$args = array(
			'type' => 'string', 
			'sanitize_callback' => 'sanitize_text_field',
			'default' => NULL,
			);


	function validation_email($input){
		echo 'validation_email validation_email ';	
		/** Sanitize input */
		$sanitized = sanitize_email( $input );
	  
		/** If output is different, input was wrong */
		if ( $sanitized !== $input ) {
		  add_settings_error( 'my_option_email', 'your-error-code', '[INFO]'.$sanitized.'||'.$input);
		}
	  
		/** Save the sanitized version */
		return $sanitized;
	}
	register_setting(
		'my_option_group', // Option group
		'my_option_email', // Option name
		'validation_email'
	);
	register_setting(
		'my_option_group', // Option group
		'id_number', // Option name
	);
	register_setting(
		'my_option_group', // Option group
		'option_etc', // Option name
	);
}

add_action( 'admin_init', 'register_mysettings' );