• Enter recovery mode

hold Command + R when starting up mac.

https://macpaw.com/how-to/start-up-mac-in-recovery-mode

• Show hidden files in Finder

Shift + CMD + .

• latest macOS

macOS 12: Monterey (Star) – October 25, 2021 (Latest: 12.4)

macOS 13: Ventura – Coming fall 2022

https://www.macworld.com/article/672681/list-of-all-macos-versions-including-the-latest-macos.html