Which programming language should I learn to make a social network /forum app

Answer 1

learn html+css+javascript for appereance and php+mysql for functionality

Answer 2

lamp,xampp or wamp must be learn
hence u will learn php and sql

Answer 3

it's done in stages,
design front end(for user interaction) using html css, JavaScript
to design back end support first practice using xamp (install it to create local servers ) with php , python .
deploy a network model suitable for you app using Java c++ ,c #(for windows)

for initial take on complete application start using android SDK awesome to understand how to use various packages, few basic example are available