Answer 1

It's PHP.
PHP (Hypertext Preprocessor) is a general purpose scripting language that quickly became the de facto server-side language of choice for web developers after its initial release in 1995. Today, a majority of sites on the web run on PHP, due in large part to its popularity as the back-end of content management systems (CMS) like WordPress, Drupal, and Joomla. Whether it’s for a simple blog or a small business owner looking to set up a professional landing page, a CMS is usually the quickest, cheapest way to set up an online presence.

Answer 2

jQuery is only a library for JS and not an own language, if I'm not mistaken.

Answer 3

i dont like php , because php has a bad syntax , but php is easy , php for runing , must install a server suchas wamp and xamp but asp is hard for learning but asp can runing to easy
also your abilities are important...
i say go to learning php between php and jsp

Answer 4

I say Asp.net core is best , but php it's a powerful language . node js is a nice framework too...