It sounds simple enough - when going overhead with load, put the load directly overhead. But the load doesn't always go where you want it to go without practice. When positioned properly, the finish of any press or jerk is directly overhead in what we commonly refer to as the frontal plane, which bisects the body between front and back. The arms should be locked out with the shoulders active and extended upward into the ears. The body should not be arched like a banana. To avoid that fault, it is necessary to maintain a tight core and neutral spine. Skill work with PVC is a must to develop the proper form.
Anne with load overhead, fully locked out, and with active shoulders.