Apple Macbook Pro 13" inch 8GB RAM & 500GB HDD Loaded w/ Catalina (OS 2019/ 2020) | eBay
macOS Catalina is here: everything you need to know | TechRadar
macOS Big Sur is here - Apple
Apple introduces macOS Big Sur with a beautiful new design - Apple
Apple introduces macOS Big Sur with a beautiful new design - Apple
Apple MacBook Pro 13.3" (Late 2020) with Apple M1, TFT Active Matrix Display, 8GB RAM, 256GB SSD, 8-Core GPU, Mac OS Big Sur - Silver | P.C. Richard & Son
Should I upgrade to Big Sur on my Mac? - 9to5Mac
macOS 11.0 Big Sur: The Ars Technica review | Ars Technica
How long do MacBooks last? How long are they supported?