It is assumed that you already have knowledge about basic 3D animation concepts such as Skeletal Meshes, Bones, Frames, Rigs, and so on. We aren't going to create new animations from a mesh, but we will work with them so, if you don't know anything about them, I suggest you to take a break from this guide to find out more about those concepts using Google or Wikipedia.
The animation system of UE4 can be divided into three main tools: Persona, Skeleton, and Animation Sequences. These tools, combined together, give you the ability to manipulate and control your Skeletal Meshes. You can play and blend animations within an Animation Sequence, create customized moves using AnimMontages, create complex facial expression with MorphTarget, and do much more.