which programming languages should I learn for web development (in order)?

Question

I have already learnt html and css

Answer 1

next is JavaScript, JQUERY

for backend: Php, SQL, and any language you want with a webFramework

Answer 2

html,css, javascript, jquery, bootstrap framework next is php, sql and wordpress or joomla framework. I would suggest you trying freecodecamp.com You jave real projects and in good order.