Blur helps with depth, focus, and transitions — they’re essential tools for clean, polished design and smooth motion.
Steps to create a blur effect
Select your layer and go to Effect → Blur & Sharpen and choose the effect. Gaussian works for most situations.

Increase Blurriness until it feels right for your shot.

For directional motion, try Directional instead and set the Direction angle to match your movement direction.

One more thing
Animate Blurriness to create smooth in and out transitions — pair it with Opacity animations for extra polish and a professional finish.
Related how-tos
How to make glowing text in After Effects
How to add a shadow in After Effects
How to animate a mask path in After Effects
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