How to use Rig Edit in Roblox studio first create your first animal model or person or a figure
For example:
create your npc or animal or monster or figure model wih parts or any other i think and then name their parts as bodies head torso and more look

after make a HumanoidRootPart as a part renamed the part to that and make it invisible and put it inside the animal or thing part inside and then group it into a model and named it any thing then open rigedit and click on the HumanoidRootPart in roblox studio and put joint in that to torso and the rest to the legs head and all now add a humanoid and start animating example are here
open the links: https://www.youtube.com/watch?v=w3Y3eb2D2kk
https://www.youtube.com/watch?v=x2MFFBvIF6Y&t=168s
tysm
like it if t is was good
tysm this is my first post guys