While working on a project that had to be completed in a short period of time, I had to test the communication function, but there was no server to pass the API to, so I had to create a local API in a hurry. At that time, I was able to access the lecture at a very timely time, and fortunately, I was able to test and demonstrate the communication function without any problems within the period :) The lecture itself was concise and focused on the necessary parts, so after completing the lecture once, it was a lecture that I could create on my own without any burden. Thanks to this, it was very helpful! Thank you!