Blender help (GFX and Mesh)

Guys, I’m new to GFX, but I’m encountering many problems, the most important of which is when I try to move a part of my body it doesn’t affect me but rather the WHOLE body. Do you know how to solve it?
In YouTube videos or tutorials you can see that I take the arm and move it, they spin as they like. Instead, for example, when I try to turn my arm the whole character turns, precisely in the sense that it doesn’t take my body parts (Perhaps because they aren’t there).

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