downloads

im just wondering as iv not used itunes befor is there an easy learning video or quick way just to suss how the basics of it works & can benefit me ? Prob sounds a dumb question but the internet is still new to me

Full disclosure: I am a total Apple newbie. This iPad Air 2 is the only Apple product I've ever used. So on PC and Android if I download a document it goes into my documents folder. Where do downloaded documents go on the iPad? How do I locate recent downloads? I promise I did search the forum...