Get Familiar and Set Up

Here you will learn about the different components on the Arduino board and then you will install IDE software and learn the program structure. 

First Step: get familiar with Arduino UNO Board. Have a look at this tutorial.

Second Step: set up and start experiencing IDE software. Visit website here

Third Step: learn the Program Structure here.

Fourth Step: learn the data types that you will use during Arduino programming here. You will find the following pieces of information:

You can also use a very useful Language Reference on website.