A common swing fault I see in many golfers is when a player opens their shoulders too quickly in the beginning of their downswing while the club head remains very high in relation to the hands. This combination creates an excessively in-to-out swing direction with open faces leading to slices and weak ball flights.
If you know this is you, or think it might be, then grab a water bottle that’s about one third full and I will teach you how to use it to shallow out your downswing.
The Drill

Grip the bottle as close to your normal golf grip as you can, cap side up.
Make a backswing and let the water settle around the cap. Then, as you begin your downswing pivot, feel like you’re pumping your arms down below your waist with the bottle pointed somewhat to the right of the target (for a right-handed swinger). Let your wrists move into a slight thumbs-down position with your trail hand palm facing the ground (right palm for a right-handed swinger). You should be able to get the water to move back down to the bottom of the bottle. I like to cue players to let their lead arm (left arm for a right-handed swinger) slide down their chest as they do this.
Pay Attention
If your hands are getting out or past your toe line before your hands get to waist level with the bottle pointing left, then you need to focus more on pumping the arms down as you start your downswing.

If the bottom of the water bottle is up and the water is still on the cap side by the time your hands get to your waist, then you need to focus more on moving your thumbs down, or the bottom of the bottle down.
And lastly, please ensure that your trail hand palm does face the ground by the time your hands get down to waist level. This will give your best chance to get the clubface square or even shut to your swing path.
Repeat this process until you can put it all together comfortably. Then start to transition to a golf club using these same principles.