To me, it seems objectively easier to pull into a parking space forward and then back out of the space when you are ready to leave. You don’t have to line up with the lines while driving backwards, and it’s easier to keep from hitting other cars as well. So why back in? To me, the only advantage I can think of is that you can get out quicker, technically.
Edit: I do not need driving instruction, just wondered why. The reasoning.
It’s easier. You need enough room for the nose to swing around because the front wheels follow a wider trajectory than the rear wheels. The access road is usually much wider than the parking spots, so backing into the spot gives you much more room to maneuver.
You also have much better visibility overall. If you go in nose first, you can’t see the front corners of your car, and you also have terrible visibility when backing out of the spot. If you back in, the mirrors show you exactly how close you are to the cars around you, and you have an unobstructed view when you leave.