The following are a couple of examples of motion graphics and animation involving keyframing, particle systems, compositing, green screen, cameras, and lighting.

Twitter Coffee Machine from Whitney Bandel on Vimeo.

dronehuntmonitorsize from Whitney Bandel on Vimeo.

Bandel_Poster from Whitney Bandel on Vimeo.

Multiple Comps and Lighting Tutorial End Video (After Effects) from Whitney Bandel on Vimeo.