I'm not sure exactly. You might have to check the official websites of popular comic con events or follow their social media pages for the latest updates.
One major milestone was the creation of Superman in 1938. It launched the superhero genre which became a dominant force in comic novels. Another milestone was the introduction of manga to the Western world. It broadened the global perspective of comic novels. Also, the rise of graphic novels as a legitimate literary form in the 1980s was significant.
Comic editors usually needed to have a background in art or related comics creation skills. They also needed to have knowledge and skills in editing, publishing, and marketing. Some manga editors might also learn about animation, digital media technology, and computer science.
Image Comics isn't typically connected in a formal way to other major comic publishers. It has its own creative teams and focuses on delivering diverse and often unconventional content.
One major milestone was the creation of the first superhero comics in the 1930s. Superman was a huge deal as it set the template for many superheroes to come. Another milestone was the rise of Japanese manga globally. It introduced different art styles and narrative techniques. Also, the acceptance of graphic novels as a legitimate form of literature in recent years is a big milestone.