I'm learning slowly along the way. However, there are some inconvenient parts due to the version issue of Vue, so I recommend that you follow along with the same version from the beginning. It takes too long to Google to fill in the gap and it's not easy to find, like Java or Spring, where you can say that there is no problem with a slightly different version. ㅋㅋ If you think, "What's the big deal if the version is different?" and just proceed with the latest version, you'll end up in many cases like this...