Piracy: ꜱᴀɪʟ ᴛʜᴇ ʜɪɢʜ ꜱᴇᴀꜱ

You need something like tmpgenc to make Blu-ray compliant discs

I don't really understand this though, the cost per GB of a blank double layer bluray is higher than an hard drive. Just store Blu-ray images (or direct rips) on the disc and access them on your device. In this way you don't need to worry about disc damages, bad burns, lost media, and so on.

At the price of a disc + the time to source and take a full disc rip + the time to source a good scan of the cover and disc surface + printing labels and covers + the bluray box (you said you want to look professional so you aren't planning to just keep them in a spindle and use a sharpie, right?) You're basically paying almost the same of a real disc

Why?

If you already have the ripped copies, they're easier and more convenient to browse and watch, you're basically just filling up your shelves with worthless coasters.

Yeah.. I wanted to get 4k collection of lotr and hp, but it's too much expensive. Then I downloaded the iso's and wanted to burn them.. And it would be much cheaper to just buy the whole damn collection, so I just browse it digitally.

Is bd the type of Disc?

Purchase a company such as Sony.

There are many user-friendly Blu-ray burning programs available that can guide you burn blu ray disc. Just make sure you have a compatible Blu-ray burner and blank discs before you start.

Fastest way? Burn it as a data disc. You can also use software to create a menu but it's not something you can do with FOSS, you will probably need to pay a lot for the software

You can burn em with your burner of course. I haven't burned discs in so long that I can't remember what software I used to use, but there should still be open source, free software that can do exactly that.

If long-term, secure storage is your goal I'd go with redundant, error-correcting digital storage with off-site encrypted backups (don't forget the password!). A proper system like that will survive a tornado (because it's backed up off-site). A home-built RAIDZ2 NAS with one of many off-site backups will work very well. If you don't want to figure out how to build that system, you can also just buy a NAS with a similar level of functionality (I do still recommend RAIDZ2 with at least 6 disks, though).

Blu-rays will eventually degrade, either from scratches or a slow phenomenon where they get little holes in the foil. Even if you keep making copies, you'll run into this problem. Of course, data corruption can also occur for files on a computer, but that's why you use a strategy that keeps ~3 copies of each file around (basically what RAIDZ2 accomplishes) so that errors can be auto-corrected.

There are other benefits to a NAS as well. You can store your own backups of your other devices there as well and have them backed up off-site. You also have the option to share your blu-ray rips over your home network, basically running your own local streaming service.

If you want to share the love, so to speak, the bandwidth of a USB hard drive is actually pretty great.