Apple iPhone 7 jailbreak and ITUNES / listening to music?

If I've jailbreached my Iphone 7 Plus, what about music playback?

I'm jailbreaking it because I do not want to spend anything on Itunes, but meanwhile I want to download my normally downloaded music (which is on my laptop) to the iphone and then want to hear it.

my questions are

this is possible without jailbreak

if only with the jailbreak, what now do after it is jailbreaked

I would definitely advise against jailbreaking.

It's easy via iTunes.

You can put the phone on your PC and then open iTunes. Next, click on the icon of your phone. Then you should see the overview. Now you just scroll down and choose to manually manage the music and videos.