The overall feeling is not very good. Teachers seem to be experienced, but they obviously feel that they have not prepared enough lessons and there are many mistakes in the training materials distributed internally. Some teachers don't have courseware in class, so they don't mention it to students, which affects the learning effect. It may be that there are many contents involved and some basic theories are not detailed. It is still difficult for non-computer majors to understand just by asking students to follow suit.