system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] How was Count Dooku able to teach General Grievous lightsaber combat?

Everything Dooku knows about lightsaber dueling is based on using the force. He’s had it for all of his life, and his style (Makashi) is largely based on using the force to analyze weaknesses in your opponent and exploiting them through extremely accurate jabs and thrusts. 

With that in mind, shouldn’t a Sith teaching a non-Force sensitive being how to fight with lightsabers be like someone with sight teaching a blind person how to kickbox?
gpt
You don't need to use the Force to wield a lightsaber. That's never been the case.

Just because Dooku is Force-sensitive does not mean that he can't teach the technical knowledge, the way to move the body and the lightsaber. He just can't pass along every little trick that a Force user can use.