Another, if you have good self-control and are willing to teach yourself, you can teach yourself, but you will take some detours. If you want to save some money, you can consider self-study.
Looking for a training institution will save you a little detour, but it will only lay the foundation and lead you in. The rest is up to you. If your self-control is not enough and bad enough, you can find a training institution.
If you are concerned, you should go to some design websites (such as Station Cool, UI China, dribbling, behance, etc.). ) Look at other people's designs. First of all, you should copy some excellent works and go to the website to collect some materials (such as petals, clip art, psdd and so on). ) and pay attention to accumulation. I really want to learn UI, and look online. There are still quite a lot of resources.
Good luck.