question about ROM 12.0, 12.1 etc

[devil--]

I have Redmi note 8 with stable 12.0.1 and after long time without have any update i check here and I see there's many ROM like 12.0, 12.1, 12.5 ... so I don't find any topic about the difference between roms and I like to know it.

Thankful

Inviato dal mio Redmi Note 8 utilizzando Tapatalk