Some useful shortcuts
| Shortcuts | Windows | macOS |
|---|---|---|
| Undo | Ctrl + Z | Command + Z |
| Redo | Shift + Ctrl + Z | Shift + Command + Z |
| Cut | Ctrl + X | Command + X |
| Copy | Ctrl + C | Command + C |
| Duplicate | Alt + arrow | Option + arrow |
| Paste | Ctrl + V | Command + V |
| Paste in front | Ctrl + F | Command + F |
| Paste at back | Ctrl + B | Command + B |
| Paste in place | Shift + Ctrl + B | Shift + Command + B |
| Group | Ctrl + G | Command + G |
| Ungroup | Shift + Ctrl + G | Shift + Command + G |
| Move backwards | Ctrl + [ | Command + [ |
| Move forwards | Ctrl + ] | Command + ] |
| Send to back | Shift + Ctrl + [ | Shift + Command + [ |
| Send to front | Shift + Ctrl + ] | Shift + Command + ] |
| Select multiple objects | Click + shift | Click + shift |
| Zoom in | Ctrl + + | Command + + |
| Zoom out | Ctrl + - | Command + - |
Many more here: https://helpx.adobe.com/illustrator/using/default-keyboard-shortcuts.html