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Created with Adobe Firefly
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Animating with After Effects
The particle system in AE can make coins rain from the sky, hearts float out from a valentine, or in this tutorial I found, bees shoot out from a nest. Custom particles can take an animation to the next level but take a bit of practice.
Alt-Clicking on the Keyframing icon allows you to type in the Expression
Wiggle(#,#) where the first number is how many times per second and the second is how big the variation is going to be. To have the values loop, however, you have to add a bit more math... The code can be copy/pasted from the external link posted here.
There are so many things to animate with After Effects that Adobe provides a special program called Bridge that helps you see previews of what they will do before you apply them to a layer or composition in AE.
Some effects have keyframes and others don't... some are easy to remove later and some sink their hooks in deep and are hard to neutralize later. Ctrl-Z is your best friend at this point, and it's never a bad idea to save a safe version before exploring the depths of AE's power.