I don't care about the application type. Right now I need to just learn one with highest demand of software companies when all different fields are considered together.
Looking at Stack Overflow's 2019 developer survey (probably the most trusted source in programming) the top programming languages are:
JavaScript
Python (used more in data science & back-end coding)
Java (used more in back-end coding)
C#
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1
mostly used one with highest demand
" could have two different answers. – Mawg says reinstate Monica Feb 21 '20 at 10:16