I am very new to this concept, so I was curious to know if we can create more than one controller node in EKS cluster or not. if yes how can we do so? Also, if not, how HA/fault tolerance is achieved in this kind of setup in the case of the control plane?

I just learned from a few videos on YouTube that we can have only one master node and can have node groups. so wanted to know how an organization achieves this HA while using EKS for their applications.