image quality - Illustrator: how to draw smooth lines - Graphic

I am creating logos or illustrations which display as pixelated lines. I am using the pen tool, any settings i should change or any tool i should add?

Liven Up Your Line Art With Smooth, Attractive Lines

Draw Facial Features with This In-Depth Beginner's Guide %

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How to Draw Smooth Lines Using the Paintbrush Tool in Illustrator

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high resolution realistic, 2D line art

How to Draw PERFECT, Smooth Lines on Your Tablet (3 Life-Saving Tips)

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Photoshop Line Smoothing Tutorial for Amateurs