Inflearn has a tremendous number of courses. There are fastapi, Docker, n8n, external servers, main domains and subdomains, blogs, YouTube, and so on - there are really many great courses. However, the key is here. They also explain why it's the key. If you don't understand, just ask and they'll explain it within 24 hours in most cases. And after listening to the core concepts, you can learn the remaining details and minor techniques from other places. (From a 3-month n8n user who completed the beginner course and is currently progressing through 13 lessons of the basic level in just one day)