Making the html line up on one line with no gaps to ensure your code works!!
I am doing the course but going to forget this idea. For a start my content needs to be short enough every time for this to be useful.
Not sure what your question is? My guess is that this is trying to demonstrate that tags can be on the same line without causing an issue. There are a lot of times when you’ll want to do this, where if you put everything on separate lines it would be a lot harder to read/understand.