This session is Foundation. It’s about getting external animations into Unreal, then retargeting them so they can be used on the UE mannequin and eventually merged/blended. Mixamo is the starter source because it removes Maya complexity while you teach the pipeline.
https://dev.epicgames.com/community/learning/tutorials/wopj/unreal-engine-epic-for-indies-mixamo-to-unreal-5-7-fbx-import-asset-setup-and-mannequin-retargeting-basics