What's the easiest computer programming language to learn for beginners?

I'd suppose Lua scripting would be something to learn if you're going to use it for Minecraft. Lua is closely related to C/C++, so you might as well dive into that while you're at it.

Start with PHP and learn the basic server-side functions such as functions and variables, then gradually grow into more advanced aspects.

There's no easiest programming language. But you can start with Python. It is a little bit easy programming language to learn as compare to other programming languages such as C++ or Java. It has straight forward syntax that can help you to get yourself into coding.

Try the following online resources for learning it-

http://www.tutorialspoint.com/python/index.htm
http://docs.python.org/2/tutorial/
http://www.codecademy.com/tracks/python

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Minecraft game is developed on Java programming language which is not a stable programming language for developing games. Most of the professional developers use C++ for developing games. But if you want to create mods for minecraft then your have learn Java for it.

You can also create side scrolling game with Python programming language. This language is powerful and have a wide support in the field of software development, game development, network programming and web development.