Tab: child Enter: sibling Shift+Tab: parent
Double-click empty space: new node
Space: edit text (Enter to commit)
Arrows / WASD: jump to nearest node Shift+↑/↓: swap sibling order
Q: auto-fit credit-card ratio E: expand to one line
C: color picker — ← → to choose, Enter to apply (or 1-7)
1-7: jump to that-numbered child of selected node
H: collapse / expand subtree
V: yellow / gray B: Big Mode
Right-click node: color / delete
Backspace / F: delete ⌘Z: undo ⌘⇧Z: redo
Z / X: zoom out / in Scroll: zoom Drag empty canvas: pan