I didn’t know anything about Java and plugin-making before Project Orion. I couldn’t manage my server completely because I had to rely on other developers. Many plugins were no longer supported, and I could not even rewrite a couple of lines of code to fix the bug.
Needless to say that for 2 years I learned to make plugins at the very good level, but of course there’s still a lot of to learn. The author of the course gives information very legibly. It’s hard not to understand something after the class. The community of MineAcademy is the best! You can ask them really any question about plugin-making and receive the answer shortly after. I definitely recommend this course!