Which computing programing language is best for Artificial Intelligence industry?

I would strongly suggest Python, with possibly C++. Python has exploded in the ML community between Tensorflow, PyTorch, and Keras. Most of the underlying code is written in C, C++, or FORTRAN since those languages are really fast, but also very difficult to learn.

There are a few things you can do in javascript (check out https://ml5js.org) for end-users, but a majority is done using python. If you have a google account, you can use google collabs to run big projects on google's GPUs (since most people don't have a great GPU).

Andrew Ng has a fantastic course about machine learning on Coursera, but it's also very math-heavy. 

TL;DR learn python with Keras to start :)