Secondly, it depends on the experience of training institutions, whether they have just done this training or have accumulated some training experience and are mature in the construction of this project. There is also whether the curriculum of the institution is scientific.
Finally, whether there are unique learning methods and skills is invisible in other institutions, and it is generally a summary of teachers' experience.
Classes should also be chosen according to their own time. Most people are office workers, working during the day and studying at night. Time is tight, so you'd better choose the one that suits you.