Trainers fly slowly, and they're stable. The student has time to correct for mistaken control inputs, and the plane won't do wierd things like stall & spin.

Aerobatic planes usually must fly faster (to keep from stalling) and are much less stable (will stall or roll or yaw quickly), requiring the flyer to make quick control responses.

Many of the key control moves can be learned by using a flight simulator. It is, nonetheless, a good idea to fly a stable plane long enough that the responses become automatic. That's about the same as saying "Yes, it is a good idea to start with a trainer."

Good luck,
Dave Olson