I've only taken about 30% of the course, but if I were to write down a few thoughts, First of all, I can really feel that you are trying to explain things as easily as possible. As others have commented, if you look at the data structure, algorithm, and Java major books first and then take this course, you will realize how much effort you put into preparing the lecture materials. Also, among the hurtful comments, many people say that you don't like that you say the same thing too much, but I personally think that, like a famous Korean history professor said, if you don't know something, it's better to teach more, so I think it would be good if you don't get too hurt by those words and give the lecture :) Subjectively, since the online course is a special kind of course where students can look back when they need to and skip over things they already know, I think it would be better for the students if you share their knowledge more. From Beginner - Basic - Intermediate 1 - Intermediate 2, Nested inner class -> Exception handling -> It was really hard to study the basic grammar of Java like generics for the first time and to try to understand it as much as possible while listening to these lectures one after another, but after moving on to data structures, I was able to draw pictures in my head and study mathematically, so I felt a little relieved. Lastly, I will definitely not study the remaining contents in vain. I will always study as if this is my last time. It is honestly really hard to help my parents with their work and study at the same time, but when it gets hard, I will gather my strength and study harder. I want to run all the way to the advanced level after this intermediate 2nd part, but I don't think I can do that due to my circumstances, so I will run hard with the Spring Roadmap that I paid for with great determination before. I will definitely get a job at a good place, make a lot of money, and definitely come listen to the remaining lectures. I am always grateful. Stay healthy :)