In Adobe Premiere Pro (PR), using Bezier curves gives you finer control over the animation transitions between keyframes, making animations smoother and more natural. To bring up and edit Bézier curves, follow these steps:
Open the Effects Control Panel
First, make sure you've added clips to your sequence that you want to animate and have applied effects (such as position, scale, etc.).
Select your clip, then find the effect property you want to animate in the Effect Controls panel.
Add keyframes
Click the Stop Table icon next to the effect properties (which looks like a small clock) to add a keyframe. Move the head to another location on the timeline, and then change the value of that effect property to add a second keyframe.
Displays Bezier curves
In the Effect Controls panel, click the small triangle next to the effect attribute you want to edit to expand the animation track.
This displays a small graph that shows the keyframes and the transitions between them.
Adjusts to a Bezier curve
By default, keyframes may be connected in a straight line, representing a linear change.
To change to a Bezier curve, right-click a keyframe and choose Bezier or Continuous Bezier as the transition type. This will cause draggable handles to appear on both sides of the keyframe.
Edit the curve
By dragging the handles next to the keyframes, you can adjust the shape of the curve to change the acceleration and deceleration of the animation.
By adjusting the length and angle of the handles, you can control the speed of the animation and the smoothness of the transition.
Preview the effect
Once you're done adjusting, Sequence to see how the animation will look. Continue to adjust as needed until you reach a satisfactory animation transition.
Using Bezier curves can make the animation look more professional and smooth. However, some practice is required to become proficient in the adjustment of Bezier curves. If you're trying it for the first time, you may need to do a few more exercises to get a feel for the effect of different adjustments on your animation.