Well, communication skills training, I don't know if you are studying or working now. If you study, you can join more school clubs or student clubs, strengthen communication with others, and your ability will be improved. The needs of some activity organizations include communication with internal members of the department and external personnel, and your communication ability will naturally improve. In fact, it is not a good thing not to join any organization at school. Without a lot of exercise opportunities, people will become sloppy. Of course, roommates, classmates and friends get along with each other, and they also have a lot of knowledge to understand by themselves, so I won't explain it too much here.
If you are already working, you will certainly expand from the people around you. In fact, it is not difficult to let people around you "overcome". As long as you are not so bad at getting along with people, people will still be willing to get along with you and observe the temperament of different people, just as different kinds of friends need you to keep different ways and be friendly to people. If business communication is different, it will actually be divided into different situations, but the unchanging concept is truthfulness, honesty, frankness and distinctive personality. If this is the case, go and buy a related book to read. It will help. Good luck.