Different majors, if you want to build a relationship by understanding this knowledge, will be counterproductive, making people feel that you are playing tricks in class, using it improperly or unfamiliar, but it will make people feel frustrated. It is better to give her some help in her studies on the premise of learning her major well (for example, it will be a surprise to help her buy a book that she really wants but can't buy, but she should work hard in advance to avoid sending books repeatedly). As for professional knowledge, support can be given, and there is no need to compile the same language.