Generally speaking, the key that serves a role similar to the Alt key on Windows is the Option (⌥) key. It’s located right next to the Command (⌘) key, which replaces Ctrl on the Windows keyboard. The right-side AltGr modifier key found on some keyboards, however, is replaced by a combination of Option + Control.
Likewise, if you ever use an Apple Magic Keyboard with a Windows PC or run Windows on an Intel Mac (through Boot Camp), you can use the Option key to replace Alt in your shortcuts. Bear in mind that this doesn’t mean that using Command while using an Apple keyboard with the Windows OS means that it’ll automatically translate to Ctrl. Command actually becomes the Windows button, while Control (for Mac) works like Ctrl.
It could be confusing, but this is where virtualization software shines. Some virtual Windows OS software for Mac, like Parallels Desktop, can translate your Mac shortcuts into a Windows environment, saving you the trouble of having to remap where your fingers travel. It’s just one of the reasons Parallels stands as the best way to run Windows 11 on your MacBook (especially Apple silicon).
