Operating systems, infrastructure, emulation, and technical history.
Understand Linux VFS path lookup, dentries, inodes, open-file descriptions, mounts, page cache, permissions and safe resolution across filesystems.
How APFS's container/volume model, copy-on-write clones, and snapshots replaced HFS+ across every Apple platform starting in 2017.
How Apple Silicon's secure boot chain differs from Intel Macs, and the stages both go through to reach the login window.
How macOS verifies that an application hasn't been tampered with and hasn't been flagged as malware, before it's ever allowed to launch.
Your Mac restarted with a 'restarted because of a problem' message — here's how to actually read the panic report instead of just hoping.
A script that worked fine yesterday now fails with 'Operation not permitted' after a macOS update. It's almost always Full Disk Access, not a real permissions bug.
Spotlight search comes up empty for files you can see in Finder. Here's how to check indexing status and force a clean rebuild without losing any data.
How Apple's 1996 acquisition of NeXT, and Steve Jobs' return, turned NeXTSTEP into the Unix foundation underneath every Mac sold today.
What actually happens on disk when you brew install something, and why Homebrew's design differs from a traditional Linux package manager.
A complete walkthrough using the built-in createinstallmedia tool to build a bootable USB installer for a clean install or major troubleshooting.