Noob Here! Need some help on what this all means

I really just want to play what I remember from my childhood as well as games that any community recommends playing in my lifetime. If I missed any games that I can play on the Gameshell, I’d love to do it. Hell, I didn’t even play Link’s Awakening until the Switch Remaster. So if I can hit up some original games like that, that would be fun.

And so I have to flash this OS: Custom D.E.O.T. V1.0+/Clockwork OS v0.4 image - With Updated Kernel 5.3.6, Latest Lima Drivers, RA1.8.1, Mupen64+ and much more! (Current version: 191122)

Over to my system, which will completely wipe it. When I update it again with a newer version, will it again wipe all my progress in games and ROMs put onto the device? That seems pretty tedious.