Unity's NavMeshAgent and Smart Terrains

Hello all,I've been working on a project where I'm using the built-in NavMeshAgent in Unity alongside multiple Image-Targets to spawn AI agents, now this part I have but what I want to do next is implement Pathfinding using Unity's default behaviors. There is a tutorial here which hits very close, but it seems  a bit out of date as the NavMeshAgent in Unity (if I'm not mistaken) is based on A*, where as this tutorial seems to push for implementing A* manually. Is there a newer version of this or would someone have any details or a direction to move in, in regards to using the built-in NavMeshAgent and Smart Terrains? Thanks in advance for anything at all on this subject, I can't seem to find much via Google and that tutorial keeps popping up in my searches.