How to put music into your iPhone using a PC?

I'm a but clueless (because I only know how to do it with an iPod). Do you connect the USB charger with the PC also (like the iPod)?

You do it exactly the same way as on an iPod…

You need to download and install iTunes on your PC (it's free at www.itunes.com) and then you need to import all the songs on your PC into the iTunes library, and then you connect your iPhone to the PC using the USB cable.

Its just like an iPod.iTunes, sync to iPhone.