I am a JS TS base I ran halfway in one day~ I am the type who can't move on if I don't understand why it is rolling.. It suits me well. Especially, the PDF file you prepared is a real build-up art. I was amazed as I went on. You are the god of build-ups. I am also reading a book called ''Facts and Misconceptions of Object-Oriented' and it is good because the lecture content complements each other. I will finish the good lecture and move on to Spring. Good