Every tutor has a maximum number of students, and if there are too many, there is no energy to guide. There must be many candidates for a good teacher. Usually, they will communicate well in advance, otherwise you won't be impressed, and you may not accept a temporary tutor.
We should know ourselves and ourselves. "confidant" includes: what level you belong to, what your research interests are, and whether you attach importance to your graduation thesis; "Know yourself" includes: who are the tutors, what is their level, and what is their research field. On this basis, choose a mentor who has a high degree of matching with yourself.