Editorial work emphasizes naturalistic learning methods at the application level (non-scientific research), that is, it requires not only logical deduction, but also a lot of imitation, practice and long-term hands-on proficiency.
The characteristics of the training course are more focused on "introduction" and "auxiliary training". Most training courses last less than half a year or even three months. During this time, what you can learn is the basic operation and common routines. Of course, this is also very important, especially for those who have no experience and poor self-study ability. It is also quite good to have a training course system to supervise them.
What really opens the gap between your editing level is often aesthetics, proficiency, light sense, narrative ability and even collaboration ability, which need to be cultivated for a long time, and it is difficult to give you training courses. Just like learning the piano, three months of training may teach you a lot of knowledge, but how dare you say that you are really good without practicing for a few years?
Since the word "telling the truth" is mentioned in the question, according to the actual situation, it is more necessary to study a craft by yourself. In addition, experts can give some advice from time to time. Only when you get through the bottleneck period yourself can you gain something. Of course, if the self-study ability is really not strong, you can introduce it through the training course, or (of course, the probability is not high) try to make some expert friends who can keep in touch after the training course, so that you can communicate at any time after the training course. The most important thing is the old saying: the master leads the door, and the practice is in the individual.