[ubuntu] I want to create partitions.

Hello.

Previously I was a windows 10 user and I installed ubuntu ( It was stupid of me to select the '2nd option' that would erase the whole hard disk, I thought it would just erase the 'C' Drive completely so no more windows...)
So now I am I am with only one partition and it is messy... I am new to ubuntu ofcourse. Never have tried any linux distros before. Before installing ubuntu I tried it first, felt nice. And then I did a install ( in a stupid way )

I don't mind loosing the data, it was mostly movies that I have already seen, and a few other applications that I often used.
But the problem for me is, I want to have partitions so that I can organize is better. Or is there a better way to organize 'My Computer'
Like I said, I am a windows user making a jump to linux. I tried searching in google, but in vain.

To give a better understanding of what I mean.
Is this.

http://imgur.com/a/2NJEr

Thanks.