How to animate weapons in blender, tutorials dont work

tutorials just dont work for me, one worked but handle bone wasnt moving, only the part, and the animation couldnt even export, can someone run me trough the steps of animating weapons in blender?
this is what kind of animating weapons im looking to achieve:

in the video, the weapon is actually rotating, not just following the arm to know how it would look when you export, and thats what i want

I believe this was already solved in another topic, so just close this topic or set the solution

yea it was, i posted the other one, thanks

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