Starfield was basically done with their release development when Microsoft aquired Bethesda

Honestly I prefer https://ohmyposh.dev it's damn nice. Not that it's a different shell, but makes any shell look nice

I don't get it. Is it just audio tweaking tools that developers can use, that they have now made open source?

If you don't mess with your EFI partitions and your windows partition you'll be fine. The windows built in partition manager works well and is good enough. If you're sitting with issues shrinking your partition, use the native Linux partition manager to do it when you boot from the USB. I'm not familiar with Fedora so I won't be able to help much there. If you do need to use the Fedora partition manager, make sure to disable bitlocker on windows for the drive before you do it. You can just enable it afterwards. Hope it helps!