Lines and shapes you can edit after drawing them.
A pen stroke follows the movement of your pen. A path is a line you place point by point and can keep adjusting: move a point, change a curve, make the line thicker. Paths and shapes work with a mouse, so a Mac without a pen tablet can still ink a page with them. On iPad they are drawn with Apple Pencil; a finger does not draw a shape.
Choose your panel first (see Your first page, step 3). Then choose the path tool, the third in the strip.
The ⊗ beside it cancels the path you are drawing.
On the right, Color and Width set the line. Cap is the shape of the line's ends, Join the shape of its corners, and Dash makes it dashed. Fill and No Fill choose whether a closed path is filled in.
Set these before you draw and the next path uses them; select a path afterwards and they change that path. A path can also have No Line, leaving only its fill.
Fill has its own colour, in the swatch that appears beside the button. A white fill on white paper looks like nothing, but it hides whatever is behind the shape.
Click the swatch to choose another fill colour; on Mac it opens the Colors window. The Fill buttons you see while a drawing tool is chosen are for the next shape you draw. To fill a shape that is already there, select it first.
The shape tool is the square below the path tool. Right-click it (on iPad, touch and hold) for Rectangle, Rounded Rectangle or Oval, then drag from one corner to the opposite corner. A shape has the same line and fill settings as a path.
Check Width before you draw: at a very thin width a shape is there but hard to see.
Right-click the path tool and choose Freehand Path. Draw a stroke with the pen and it becomes a path, with the same points and handles as one you placed by hand. This kind needs a pen; a mouse does not draw it.
On iPad, touch and hold the path tool to choose between Path, Path Edit and Freehand Path, and touch and hold the shape tool for Rectangle, Rounded Rectangle and Oval. A plain tap takes the one you used last. The small triangle in a tool's corner means it holds more than one.
With the selection tool, click a path or shape on its line. A shape with no fill is empty in the middle, so a click there selects nothing.
Option-drag copies a single path or shape. A combined shape (after Unite or Subtract) does not copy this way and returns to where it was; use Copy and Paste for those.
Select a path or shape and press Edit Path on the right. Its points appear as small squares.
The four small buttons under Anchors work on the selected point. Rest the pointer on one to see its name. A button is grey when it does not apply to this path.
Split and Cut Open are never lit together: one is for an open path, the other for a closed one.
A rectangle also has Corner Radius here, to round its corners. A rectangle or an oval from the shape tool is a shape, not yet a path: with one selected, Convert to Path under Path Operations turns it into a path, for the things only a path can do. Choose the selection tool again when you are done.
Select two shapes and the right side offers Path Operations: Unite, Subtract, Intersect and Exclude. Unite and Subtract are shown with pictures in Balloons and tails. Intersect keeps only the part where the shapes overlap; Exclude keeps everything except that part.
Group. Select the things that belong together (⌘A selects everything on the layer) and press Group under Path Operations on the right. From then on a click on any one of them selects them all, with one set of handles around the group.
With a group selected, Ungroup separates it again.
Change one thing inside a group. Select the group and press Enter, on the right. Now click one member: it gets its own handles, and you can move it, resize it, turn it or stretch it by a side, while the others stay where they are. Exit takes you back out. Pen strokes are the exception: a group of strokes moves and resizes as one, and to change a single stroke you ungroup first.
Cut, copy and paste. ⌘C copies what is selected, and ⌘X cuts it: it leaves the page and waits to be pasted. ⌘V pastes a little down and to the right, already selected with its handles, ready to drag into place, whatever tool you were holding. Paste in Place (⇧⌘V, in the Edit menu) puts it exactly where the original is. On iPad these are in the Edit menu in the toolbar.
Place a picture. Press the + button in the toolbar and choose Place Image, then pick a file: a photo, a scan, or a rough from another app.
The picture lands on the layer you are drawing on, fitted to the page. It is one more thing on the layer: select it to move, resize or turn it, like a shape. If it has become larger than the page, Fit Selection to Page on the right makes it fit again.
You can also drag a picture onto the page, from the Finder on a Mac or from Files on iPad. It lands where you drop it, made smaller if needed so that it fits inside the page. A PDF of one page is placed the same way; a PDF with more pages is refused.
Fit Selection to Page, on the right, appears when the selection needs shrinking to fit within the page's margins. It makes it smaller, evenly, and centres it. It never enlarges and never stretches.