You wrote the expected Q&A really accurately. There is nothing that cannot be found if you Google it. However, if you Google it, information comes out in fragments, so it is difficult and time-consuming to assemble it like a puzzle. This lecture is a good lecture that greatly reduces the time spent on solving the puzzle. However, there are a few things that are disappointing. 1. The recording sound seems a little low. I have to turn up the volume quite a bit to hear it clearly. Also, it seems like you recorded your original voice and modified it? I am not sure if you really needed to modify it. 2. If there are other students who follow the lecture and run bundle exec jekyll serve in vscode, but cannot enter their GitHub blog address in Chrome, there may be cases where it is not possible. In that case, if you start over from the beginning and upload to the repository last, it will work properly. After creating custom, comment function, previous post, next post -> uploading to the repository -> and doing search engine optimization, the blog was created properly. 3. The comment function and the previous and next post buttons do not work properly. Even though I copied and pasted the code you mentioned, the comment function and the previous and next post buttons are not working. Despite the three shortcomings above, this is a good course for creating a blog quickly. I highly recommend it to those who are trying to create a blog with github.