This is the sort of issue where you can probably consult with 5 different experts and get 5 different answers. So, let's have a look and see what consensus we can reach about what the most important thing in golf swing actually is.

Your body

This may come as a surprise to you, but it shouldn't. What do you use to execute a golf swing? Your body. So it should go without saying that your body plays a critical role in your golf swing, and pretty much everything else ties into that.

Spend time on getting your body fit for golf. This includes improving your flexibility. Turn your body into a golfing machine and you'll be well on your way to improving your golf swing.

Not only will fitness allow you to practice longer, it will also help you concentrate longer. We all know how tough it is to focus once fatigue sets in.

Golf is a sport - to be good at it, you need to train your body for it, because your body is going to do all the hard work.

Find your rhythm

You need to nail down the basics of swinging that club, and this will take both practice and professional coaching. Get a capable coach to help you work out your balance, the correct speed and angle of your backswing, the acceleration when you swing forward. There's no easy one shot way to fix this.

It's critical to get a smooth rhythm going in your swing, and this comes with practice, and with practice comes confidence. If you're still uncertain about what you need to do and how you need to do it, you'll struggle to swing properly.

Find expert assistance and keep practicing to build your confidence and to settle into a nice smooth flow and rhythm. That's when you'll start hitting them smoothly and consistently.

Mental Strength

Mentally, the most important thing in golf swing is to accept that you're not going to be a pro overnight. It's easy to get dejected when you struggle to get even a seemingly simple principle correct in practice.

Remember that everyone starts out being unable to even hit the ball or slicing and hooking it all over the place. The only way to improve is to keep at it, and this will take dedication, practice and enough psychological strength to push through the difficult learning process.

Be sure to enjoy the process. Take it one day at a time.

As you can see there simply isn't one thing that can be narrowed down as the most important thing in golf swing. It's a combination of physical, mental and skill factors that all come together. Neglect one and you diminish the impact of the others. Don't take shortcuts - become a complete golfer by focusing on all the important factors that contribute to a great golf swing.