You can train with a foundation, because the training speed is relatively fast, and you can't keep up without a foundation.

In fact, the most important thing in learning is the teacher's personal experience. The recommended job is still unreliable (not good for study). If you learn well, you don't have to worry about not finding it. The training institutions are all similar. Just find a cheap one. The key is perseverance. Compared with self-study, the training cost is lower (self-study is time-consuming for beginners).