Here's how to hit a 3 wood in golf:
The most common mistake that beginners will make with their 3 wood is thinning the ball. They are not making really good contact with the ball from underneath to get height and distance.
If you are hitting the top or middle of the ball, you will not be able to hit the ball very far because it could make the ball spin off anywhere and you will not have control over it.
You might be taking a bit of the ground out because you need that low contact with the ball.
Balance
By the end of the shot, you might have watched how people finish after their shot where they watch the ball fly through the air.
You want to be finishing feeling balanced at the end of your shot and holding that position for a good two seconds afterwards.