Which NAS as a beginner?

I decided to buy a NAS for my home network. The main purpose of this is to relieve the storage space on our PCs / laptops at home by storing all pictures, videos, etc. On the NAS storage. A central storage location.

I also have an internet cable at the front door to which I will connect an IP camera. In the NAS, it should be possible to record these recordings or provide them as live images, almost as a separate cloud.

I'm an absolute beginner in the field, what do you recommend?

I recommend Synology DS218+

And a RAM upgrade! (You can just push it in.

Thank you. At Amazon there are different TB sizes and a version "enclosure". What does that mean?

Enclosure is where you have to buy hard drives yourself.

So there are no built in!

Ah okay thanks 2TB would be enough for me. At least for our data.
What about the camera story? Is that possible? So run / record the IP camera on the front door

Check this out with the IP camera here:

https://www.synology.com/de-de/compatibility/camera