I have seen many GA4 lectures on other sites, including GA4 books on the market, but this is the most systematic and easy to understand. Seriously,,,, Until now, my GA skills were like a sand castle that would fall apart at any moment, but thanks to this, I have a solid grasp of the concepts. I hope you take this lecture instead of spending hundreds of thousands of won on other places. - Posted by a buyer who paid for it himself -