This is a great lecture to understand modularization. When you search for 'making a quest system', it is not a hard-coding method that comes up, but a method that can be expanded later through modularization, which was really helpful. As a beginner who has only been using Unity for a month, it was a little difficult to understand, but if you study the code carefully, it is a good lecture to understand how to modularize for expandable development.