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The depth of your post hole depends on your post length. If you decide on a two-rail fence, the posts are likely 6 feet long. You want your hole to be at least 1/3 of the post length. In this case, your post hole should be two feet deep.

If you opt for a three-rail fence, the posts will typically be 7 feet long, meaning your post hole should be 28 inches deep.

Installing a picket fence includes measuring and marking the area where you plan to build the fence, laying out all of the materials, digging post holes, setting the posts using concrete, measuring the rails, attaching the rails, attaching the pickets, and then painting or staining the fence if you chose a wooden fence material. 

A fence gate can sag for several reasons. The issue often stems from the hardware, such as damaged or bent hinges, or loose screws that can no longer support the gate's weight. The gate frame itself might also have come out of square due to failing supports. Alternatively, the problem may not be the gate but the supporting fence post, which could be leaning or out of place. In many cases, fixing a sagging gate is as simple as tightening the hinge screws or upgrading to more robust hinges.

A metal fence can last for over 30 years if maintained correctly, though the exact lifespan varies by material. For instance, chain-link and aluminum fences can function well for 25 to 30 years, while corrugated metal fences may last up to 60 years with regular maintenance. The lifespan can be shortened by harsh weather, abuse, or lower-quality materials. Galvanized metal tends to last longer due to its protective barrier, whereas sheet and corrugated metal may rust faster than solid pieces.