I purchased a used MacBook Air m1 from BestBuy and I’m completely new to Big Sur. Everything is setup but I noticed before downloading anything the overall storage space seems a bit odd. System preferences shows 251gb of flash storage with 15gb allocated for “system” and then 17gb of “other.” In disk utility it looks odd, like a partition is setup perhaps? Is this how Big Sur formats things and what is the .com.Apple os update below that? A picture is attached for reference.