It’s so easy that you’ll never go back. There are options depending on what you want to do too. I primarily store entertainment media, so I ran a simple Ubuntu Server for years with cockpit installed so I could easily mount and manage drives and PLEX to serve the media. It got me hooked, and worked flawlessly.
I have since become more ambitious and run ProxMox with an Open Media Vault VM to serve the media through NFS to other VM’s. My experience with Open Media Vault has been that it is a bit more complicated than my previous setup, but has resulted in a lot more flexibility with how I can access the data from multiple computers.
I will warn you though that the collecting can get addicting. It’s always easy to justify adding just one more drive to the system, and they get cheaper and bigger every year.