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Adobe Illustrator is primarily a vector based design tool to draw clean shapes and to create resizable Logos. Whereas Photoshop is raster based and therefore pixel dependent, Illustrator is using vector shapes made out of anchor points.
Therefore the Pen Tool in Illustrator is ideal to draw paths with anchor points:
With a simple mouse CLICK, you are setting corner anchor-points. If you are clicking AND dragging with the mouse at the same time, you’ll get round anchor-points with levers, with those are round corner points and curves possible.
The Pen Tool is ideal to draw closed shapes. It’s easy! Draw your shape while setting your points until you reach the first anchor-point again; select it to close the shape and choose a fill color.
Video Tutorial for beginners:
The Pencil Tool draws lines which you can combine with the Width Tool.
To open the options for the Pencil Tool: Double click the Pencil Tool icon in the tool sidebar. The same way you may open the Brush options if needed.
The Pencil Tool is ideal to draw lines. If you do need to close the open path into a shape;
you either have to select both end-points and go under Menu > Object > Path > Join or use the shortcut ctrl+J for PC / command+J for Mac.
Video Tutorial for beginners:
The Width Tool in Adobe Illustrator CS6 is ideal to give your line a Brush stroke character: select the line and drag with the mouse until the line becomes wider.
The Pen Tool and Pencil Tool are both ideal to draw clean shapes and lines. The Width Tool can help to simulate a brush line. Although to achieve structures and water color effects; the Brush Tool would be a better choice!
The Brush Tool and its options are easily to find under Menu > Window > Brushes.
On the bottom of the Brush-Option, you may find the icon for the Adobe Brush Library with all kinds of artistic brushes.
How to create your own Brushes or alter existing Brushes in the Adobe Library, will be shown in a future tutorial.
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Additional tutorials for advanced users:
Drawing in Illustrator for advanced users
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Very helpful and useful. Thank you.
Adobe Illustrator is the best optionsee for figure construction. I think vector drawing is very good way of making great illustrations much faster and more efficiently.
A graphic tablet like XP-Pen ( https://www.xp-pen.com ) is nice to have and if someone do a lot of illustration or free-hand drawing work, then yes get one.