Will It Blend?
Illustrator Best Practices
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Outline fonts before sending to print
Type → Create Outlines locks in the typeface.
Use Global swatches
Edit a color once, update every object that uses it.
Name your layers
Default 'Layer 1' tells nobody anything when you reopen later.
Save regularly
Cmd+S — Illustrator can crash on complex files.
Master Illustrator at Noble Desktop
Noble Desktop's Illustrator Bootcamp teaches the Pen tool, vector drawing, and pro illustration.
Explore the intricacies of Adobe Illustrator through this detailed tutorial, covering various topics including the Blend tool, blending options, color blends, reversing blends, and controlling blends for a more nuanced design output.

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, click in the middle of the small circle (not on the outer path). Move it around and see how the blend updates itself.
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