Attention - you could run into problems with the KDE neon installation ISOs at the moment:
Neon […] ISO broken
Better wait until a new one is released…
Otherwise what @janr said.
PS:
If you have no experience with Linux at all it could be an adventurous point in time to start with KDE neon, because Plasma 6.0.0 was released some days ago and is shipped with KDE neon - you will encounter bugs.
I sincerely appreciate the work of the KDE neon team, but consider waiting until at least the 6.0.1 version of Plasma is shipped on the KDE neon installation ISO.
Or try something more “semi-conservative” like Fedora KDE Spin or TUXEDO OS or something more “conservative” like Kubuntu first…
And be aware that using an Nvidia card with Linux requires extra, informed, steps.