didn't see it mentioned anywhere or if you already know but, make sure you have enough post in the ground and a layer of a few inches of rocks under it so its not standing on dirt. im told doing that lets the post last longer before it rots.
I think the rule is 1 foot in the ground for every two feet above it and one 80 lb. bag of cement for each post but I like to put two bags on each gate post so it adds strength.
im no expert on it. im sure someone knows the exact formula
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