I took this course while looking for a course that applies TypeScript code and theory that is actually used. I do not use TypeScript in my work or as basic code, but while taking the course, I got a feel for how to apply TS, and I gained confidence in TS. These days, TS is becoming popular, There are many lectures on TS theory, but it was hard to find content that deals with case-by-case error handling or actual grammar like this. There were some disadvantages, but the advantages outweighed them and it was a great help. If you have taken the basic theory of TS, if you are curious about how TS is applied in various cases and actual code, or if you feel uneasy about a course that just explains the theory and ends, I highly recommend this course. Above all, I sincerely thank you for always answering questions about the lecture-related code! It is the most impressive and grateful course among the TS courses I have taken here! Really, I hope many people will know about TS on the main page, saying, "This is the course."