The price was expensive, but it was definitely worth it if you listen to the lecture content! The part that explained grammar in detail was good, but the best part was the part that explained in detail how the code works in memory. I didn't know much about how memory works, how to manage it, etc., and this lecture was really helpful to me, who had never tried to understand it!! Even if you already know grammar to some extent, if you want to learn more about how memory works, I really recommend this lecture!!!