Haven't heard much about it. If you want to know, I suggest a field trip and consider the following aspects:

1, regardless of whether it is formal or not, choose a big company if you want, and don't choose a small organization that a few people improvise. There is no guarantee.

2, working time, whether this description is professional.

3. Economic strength, this is the guarantee.

4. The teaching environment directly affects the learning effect.

5. Is there a professional team of teachers and R&D teams?

We can draw a conclusion from these aspects ~