If an exercise does not feel right to you, then you need to know how to adapt it or whether an alternative exercise might work better. Even when you know your technique is correct, you may still experience pain or discomfort, or the exercise just might be too difficult or heavy for you.
Understanding the simple strategies of exercise progression (making it harder) and regression (making it easier) will allow you to structure the most effective training approach. Knowing how to progress and regress exercises will also enhance your training experience and confidence and keeping your motivation at an all-time high.