• https://www.w3schools.com/js/js_math.asp

JS Objects, JS Functions, JS Classes, JS Async.

• https://www.w3schools.com/js/js_object_definition.asp
• https://www.w3schools.com/js/js_function_definition.asp
• https://www.w3schools.com/js/js_class_intro.asp
• https://www.w3schools.com/js/js_callback.asp

JS HTML DOM, JS Browser BOM, JS AJAX

• https://www.w3schools.com/js/js_htmldom.asp
• https://www.w3schools.com/js/js_window.asp

AJAX XML File, AJAX PHP, AJAX ASP, AJAX Database, AJAX Applications, AJAX Examples

• https://www.w3schools.com/js/js_ajax_intro.asp

JSON Server, JSON PHP, JSON HTML, JSON JSONP

• https://www.w3schools.com/js/js_json_intro.asp

• https://www.w3schools.com/js/js_jquery_selectors.asp