What is the proper posture for barre cords / how to keep wrist from getting sore?

I am still a *baby* guitarist, but trying to get the technique down on barre cords. My left writs gets sore super quickly doing so, and I assume this is a posture thing. The whole thing is very hard to hold and feels very awkward. Is this what is going on or is it something else?

I can't really find any videos talking about hold your hand other than the basics of "put ur pointer over the whole neck". Does anyone have a good guide to show how your supposed to hold your left hand in a barre cord?

submitted by /u/Oddish_Flumph
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