Also, the structure of the torrent. Sometimes people upload sets of ROMs with metadata, guides, and documentation. So it's not just the ROM files but also tools to set them up. So that's worth mentioning.
I need to check some facts here. What torrent sites are commonly used for ROMs? Maybe sites like The Pirate Bay, 1337x, or others. But I should not list them explicitly. Instead, suggest searching online. Also, note that some torrent sites might have legal ROM sets, like those distributed by companies for archival purposes. But MAME itself is open-source, and they don't distribute ROMs. Full sets can be huge, so torrenting makes sense for the file size. torrent mame extra quality full set roms link
Wait, but MAME itself doesn't release ROM sets. They release the emulator. The ROMs are separate. So the full set would be all the individual game ROMs that you can use with MAME. So a torrent that includes the full set would be all those individual .zip files. Also, the structure of the torrent
Possible pitfalls: torrent clients, magnet links vs. .torrent files, tracker issues, legal risks in various countries. Also, the issue of SHA1 hashes to verify the integrity of the ROMs. Maybe mention how MAME uses these hashes to ensure the right ROM is used for each game. So that's worth mentioning
