Since I'm a C# beginner, it was really difficult at first. It took me 3 hours just to watch one lecture. Concepts like delegates and events were unfamiliar, and I didn't even know Unity had custom editors. Now I've gone through it more than 3 times, applying it to personal projects and creating additional quest and achievement systems beyond just the item system. Through this practical application, I'm starting to understand it better. This is such a great lecture that can be applied to various projects. Personally, if you have any game development projects, I'd love to see your game development process too.