Hello: the so-called writing opinions on the research direction of the major you are applying for, that is, understanding and mastering the major you are applying for, is the tutor's comprehensive investigation and understanding of your professional ability, level and future study. Writing well is more important.

For the understanding of your major, you need to refer to relevant professional books to write. It's not easy to write too much, about 3000 words is more suitable. It mainly focuses on the development trend, application situation and areas that need to be worked hard in the future.