Where does iTunes files go?

Every time i connect my iPhone to the iTunes it starts syncing the apps and every thing and now my "C" Drive has no empty space and i can't find the iTunes files to delete it. WHat should i DO?!
Please ANSWER

I need a funny but not too informal response to my professor?

There was a typo in his email response and he said "I'm (professor s name) iPhone 6 and i take responsibility for any typos or errors. Its not his fault. Seriously.

I just emailed him about the price of the textbook so i haven't met him yet but i thought it hes response was funny

I have all of his passwords and can't find anything?

My guy and I dated for 8 months and made it official last month. While helping him job hunt, he gave me his password so that I could help him apply for job. Well, surprise, surprise- it's his password for both of his email account plus his social media accounts. I'm perplexed bc I can't find any dirt (except for some old d*ck pics he sent to his ex last year). So I'm wondering if he gave me the password mindlessly, or actively realized that by giving me one pw, he was giving me all of them and so maybe he did some clean up work.

I just expected to find something bc I always have found dirt when snooping on exes. Do I just have a blemish free boyfriend or is he hiding all of the good stuff in his iPhone?

I know, I know I suck as a person and a girlfriend and shouldn't be snooping. Watever. Just want your take on things.