Statics: Using the Right Hand Rule to find the Direction of 3D Axes and Moments

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[Googlename]

good thank you,
Iam from Iraq, I enjoy your youtube videos

[jobinkunnath]

thank you very much sir, this has really helped me

[TheHonchoofAllSpearheads]

ok so we curl our four fingers of the right hand and the thumb up denotes positive and thumb down denotes negative. but how exactly do we know which side the thumb as the reference while maintaining the curl direction? you get what I mean sir? it's hard to explain but I hope you get my drift and can help clarify on this.

[vfgrfbgrb]

Do you mean direction where force is going toward