Synology DS225+ Private Cloud Media Server - Stream, Back Up Photos & Share Files, Intel CPU for Hardware Transcoding (2-Bay Diskless NAS)

For a first nas for a beginner who wants to have everything just work and wants to have a good experience learning about how things work so they can do something more advanced next time, I'd recommend something like this: https://a.co/d/00bEVFlH You can upgrade ram and storage, but I would not recommend upgrading CPU on a pre-built. Save that for when you want to make your own custom solution from parts once you've used something like this for awhile as training wheels.