Financial training, banking and insurance are relatively mature, but specialized securities seem to be rare. Many say it is professional securities training, but the cited cases are all from other industries. This is said in theory, but it is difficult to learn from it in practice, which is a bit like "selling dog meat by hanging sheep's head". Personally, I have listened to many classes, among which those related to the securities industry are quite satisfactory. I recommend Mr Xia Chuan.
The internal training teachers of some large securities firms are also good, such as Li Daquan of Everbright Securities. I have attended his class and have rich practical experience. The combination of theory and practical cases is very good and awesome. But I'm afraid it's not convenient for such a teacher to give lectures outside.