Lauren Patterson posts a great introduction for beginners showing the process for creating a classic motion graphics project using vectors from Adobe Illustrator.

In this tutorial, we will walk through the basic process of how to prepare an Illustrator file, and how to then properly import & animate the file in After Effects

One of the key things that often gets overlooked initially are the nuanced principles of animation which would still apply even when creating animation as simple as two keyframes.

Here Lauren emphasizes simple things that will add some polish to an animation such as secondary animation and some graph edits for controlling eases. Check out the tutorial for Getting Started with Animating Vector Assets in After Effects here.