Retopology is recreating a model’s surface to make a cleaner mesh, having a simplified version of a model will be better for animation.
Character Retopology
Now that I am happy with the character model I can new start retoplogy.
Good topology is usually just quads. Occasionally you can have triangles. Anything more than 4 sides (polygons) is a sign of bad topology.
The topology should flow in loops (this is rings of quads) the loops should flow along the shape. However, there will be areas where that this isn’t possible.