How do I transfer a song from Itunes on my computer to my Iphone 7?

How do I transfer a song from Itunes on my computer to my Iphone 7?

You iPhone should have had a USB cable with it. Just connect it to your computer when iTunes is up, and you can transfer all of your songs, or ones you want specifically.

as long as you're signed into the same iTunes account on your iPhone, as it is on your iTunes on your PC, you should be able to just re download them onto your iPhone through the Apple music app. Go back to your purchase history and re download the onto your phone. You won't be charged twice.

Connect your phone to your pc.