What are the steps to create and manipulate After Effects keyframes for animation?

To create and manipulate keyframes in After Effects for animation, follow these steps:

1. Select the layer you want to animate.
2. Move the playhead to the time where you want to set the keyframe.
3. Click the stopwatch icon next to the property you want to animate to create a keyframe.
4. Adjust the property value at that keyframe.
5. Move the playhead to another time and adjust the property value again to create another keyframe.
6. After setting keyframes, you can adjust their timing and interpolation to control the animation.