Los Angeles style fence and main entry gate on a very stiff slope. When building horizontal fence on a slope there are two ways to install it: first one is as in the photos, build the fence with steps, keep in mind, some of the post will have be higher than your fence height to support the panel on the left and the right.
Second way it to have the horizontal slats parallel to the ground. That means, the fence everywhere will be same height from the ground. This option is usually more common on very light equal slope.