As
Eidolon said, going to the range and firing X amount of rounds is
practicing, not training. If you do that without having the training, it is nonsensical.
Training is when you attend a class where an instructor teaches you things. Practice is when you regularly repeat what you have learned to get better at it. When you go to the range and fire X amount of rounds, how do you know that what you re doing is correct? How do you know that you are doing the right exercises using the right procedures?
I highly recommend training with a professional firearms instructor, particularly with one that has a good reputation. Mandatory training that is required by the state is really just the beginning of a long road. Training via YouTube videos is not really recommended for a new shooter. An instructor will tell you what you are doing wrong and correct it. Your computer screen won't.
In a single-day defensive handgun training class, you will shoot 350-600 rounds, learn safe gun handling at all times, learn a lot of details about proper procedures, and learn to understand the proper mindset/attitude. For new shooters, it is highly recommended to take such a single-day defensive handgun training class and practice what has been learned for 6 months. Then, you can take the next level defensive handgun training class with the same school, and so on. It is a progression over time.
Lastly, there is not only live fire practice, but also dry practice: