Keyboard shortcuts.
The editor is built for the keyboard. These are the ones worth learning.
Editing
Undo⌘+Z
Redo⌘+⇧+Z
Delete selectedDel
Deselect / exit text editEsc
Layout
Group selected⌘+G
Ungroup⌘+⇧+G
Nudge 1px↑↓←→
Nudge 10px⇧+↑↓←→
These docs
Search the docs⌘+K
On Windows
Use Ctrl wherever these show the Command key.