How to keep my iTunes after resetting my laptop?

So I'm planning to reset my laptop as its running slow and I have so much crap on it. I use my iTunes to save everything on my iPhone, I also have iCloud which I'm not sure how it works, but my phone is always connected to wi-fi. I have saved all my songs on usb so when I reset my laptop I can put my songs back on as I know after I reset my computer I will lose everything on it. I just don't want to lose all my apps and contacts etc on my phone… Anyone know the best thing I can do to prevent losing everything?

You can avoid your laptop from running slow without resetting & formatting, because in this procedure you will loose your data so I would suggest you apply the following steps to make your laptop faster:-

1) Disable Firewall.
2) Uninstall unnecessary programs and files.
3) Run disk cleanup through system tools.
4) Turn ON Windows updates and update device drivers.
5) Limit start-up items and manage background running services (must use reliable program RegInOut for it.)

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