Add a note (N) puts a live note on the board: find one or type a title for a new one. Double-click a note card to open it.
Sticky note (T), or double-click empty space, adds a sticky note; double-click one to write in it.
Add images, or drop them onto the board.
Pen (P), marker (M) and eraser (E) draw over the board. ⌘Z undoes, Delete removes what's selected.
Drag the background to move around, scroll or pinch to zoom, Show everything (0) fits the board on screen.