I want to figure out how to manipulate a player so I can make crouching, running, aiming, etc. I do not know how to do this and I do not know where to find out.
I know this is not very specific, but I just want to know how to make an arm/leg go from point A to point B without it falling off,

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And "Neck" is for the head.
When I ran that code, It first told me that there was no LeftHip, so I added a space and that was fixed. But then it said CFrame is not a valid member of Motor6D.
Woops, it's C0, not CFrame. Let me edit my answer.
You could use C1 too, by the way.
Thanks!