Set New Post in Concrete

What happens here

The new metal post is carefully placed into the freshly dug hole, ensuring it is properly oriented with the welded bracket. Several 80lb bags of Quikrete concrete mix are then poured directly into the hole around the base of the post. The presenter then adds water to the concrete mix and uses a shovel to help mix and settle the concrete around the post. Finally, he uses a level to ensure the post is perfectly plumb before the concrete sets, adjusting as needed.

Goal: Anchor the new support post securely and plumb