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[godrain]

So, for machine learning the best option would be Python(very many people use it, because TensorFlow and wide selection of other libraries) or c++.
For web development you must know html, css AND any other language(Python, go, javascript, php, c#...)
For making smart contracts great option would be GO, also may be C++, Python, C#.
It is better not to limit yourself to one programming language, but you are newbie. Based on your preferences I would start learning Python or GO. Yet better choose everything yourself, good luck

[actuealth]

Since a lot of people have suggested that you learn C#, I have a follow-up idea for you:

Learn Golang which is the Go programming language launched by Google back in 2009, using C#. It has concurrency routines that best use the multi-core processors that are used nowadays. Remember, all other languages are tailored to a single core structure.

So, there is this hardware basis for it to succeed, and then it's Google who launched it.