A course that builds up the contents needed for practical application step by step one by one When I took other courses, it doesn't explain theoretical commands that seem to be in books for loops, conditional statements, variables but it gives a clear guide to use them like this in actual practice! The best course If I were to make a course, I would make it like this. I think it would be a little confusing without prior knowledge. vim, Linux environment, docker, yml, etc.