Do you have to have a teacher to learn piano? How to adjust the practice time and frequency?

There must be a teacher, and don't think about self-success. Now many people have a misunderstanding about learning musical instruments. They think it is enough to learn the sound principle of musical instruments. As long as I can press the sound on the piano and pop up a little star, I can play the piano. Maybe some instruments are like this, such as clarinet, so why can everyone learn clarinet in primary school music class, but even the primary school affiliated to the Conservatory of Music can't give all professionals the opportunity to learn piano? The threshold of piano lies in the introduction, and the guidance of professional teachers is most needed in the first few years of laying the foundation. Professional teachers themselves have been trained in piano education and know how to bring a zero-based person into the world of piano. Some people may think that playing the piano is just pressing keys, which is similar to typing, as long as you press a specific sound at a specific time on the score. For such a person, I can only say one thing, no comment. Even if you think piano can teach yourself, do you think ballet can teach yourself? Can a symphony conductor teach himself? You are as elegant and elegant as watching ballet in the video. Can you dance with it yourself? Look at the manner of the conductor in the video. Can I swing a stick for you? If nothing else, let's look at the way we type on the computer keyboard. People who have studied the piano are also playing the piano, while those who have not systematically studied the piano have all kinds of strange postures. When I play DOTA, I regard heroic skills as white keys and items as black keys. Teachers are needed to help correct purely physical things, such as how to put hands on the keys, how to exert strength with fingers, where to put arms and how to sit on the piano stool. I used to run a gym alone for almost half a year, and I felt almost ineffective. Now I have hired a personal fitness trainer, who has made many corrections for me, told me the correct way to use the equipment and carried out safety protection during my training. I think it is expensive, but it is worth it. Compared with practicing blindly, you get twice the result with half the effort. Just kidding, I threw all the money I earned teaching piano this summer to the fitness instructor.