Metatrader programming language (MQL5) is based on C++ but aimed to build specific application to the trading terminal.

While learning C++ isn't a pre-requisite to learn MQL5, a basic understanding about programming logic is definetly needed.

The thing about trading robots is that they don't do any miracle, and they are as good as the trader using them.

To make a good use of one, the trader must understand how it works, and even when to turn it off.

I wonder if these robots have the ability to have artificial intelligence or machine learning?

It's a bit advanced to me, but i have seen some articles about these kinds of robots.