The pen tool lets you draw straight lines and flowing curves. Although it is less intuitive to use than the pencil tool, the pen tool offers you the advantage of creating streamlined paths that can be controlled and reshaped with great precision. With a little practice, you'll be able to draw combinations of straight and curved segments to create flexible, smoothly shaped illustrations. Editing Selecting objects Before your edits can take effect, you must first select the object to be modified. Any edits you make affect only the objects that are currently selected.
Illustrator provides several tools for selecting objects or parts of objects.
Once you have selected an object or set of objects, you can begin making edits. Edits can range from the basic moving and duplicating of objects to more intricate modifications of shapes. Because Illustrator defines objects mathematically as vector graphics, you can edit your artwork repeatedly without losing any quality of detail. Vector objects always retain their smooth, crisp outlines, regardless of how they are scaled or modified. Grouping objects By gathering several objects together in a group, you can apply simultaneous edits to all the objects while preserving their relative positions.