Q: How can I reduce the size of "Others" on my iPhone 5?

So, everytime i connect my iPhone 5 to iTunes it shows the stuff i uploaded on it in the Summary tab, you know, music, video, photos etc. But then there is "Others", which were somewhere around 500 MB when i first connect the phone, but it recently grew up to about 1 GB and more, so i just wanted to know how to manage the "Others" contents and reduce its size once i need it.

Sorry, if my question may seem to stupid or noobish.

Thanks.