Yes ofcourse! It will definately helps in achieving lots. In order to conquer any art, what you need the most is practice. Practice and hard work is the key for success. If you're planning to join theatre instead of that you can join media school. That will help you in placements and expose you to the live environment. For more you can visit https://www.theiceinstitute.com/index.php It was started by Balaji Telefilms in 2010.
Yeah obviously performing in theatres really helps in achieving something good in the field of acting. It will boost your confidence. Day by day, you will do better and the best benefit thing you will get from this is you will lose stage fear. The more you practice in front of audience, the more you will know your faults. It will really help in giving auditions anywhere and help you in making yourself better. The various types of drama you perform, the more you get the skills and it will really be fruitful.