Intro
Blender on Mac uses the same shortcut system as on Windows for most operations. The most important Mac-specific issue has nothing to do with Command vs. Ctrl: it's the numpad.
Blender relies heavily on numpad keys for viewport navigation, front view, side view, top view, perspective/orthographic toggle, and camera view are all one-key numpad presses. Most MacBook keyboards don't have a numpad. Blender provides a solution, but it requires a setting change.