Color grading fixes exposure and color balance — it’s how you make footage look polished.
Steps to use color grading effects
Apply Effect → Color Correction → Curves to tweak contrast and brightness.

Use Effect → Color Correction → Levels to balance blacks, midtones, and whites.

Apply Effect → Color Correction → Hue/Saturation to adjust or desaturate colors however you need.

One more thing
Use Adjustment Layers for color corrections that apply to multiple clips at once instead of adding the effect to each layer individually.
Related how-tos
How to add adjustment layers in After Effects
How to add gradients in After Effects
How to blur video in After Effects
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