Some examples...

Basically no real headers or proper separators.

About the github repo, no you do not need to put everything in a single file. Upload your project work, and pinpoint the files you are using, just like you did in the tutorial, but use correct file names. I still do not understand the difference in file names and structure compared to your screenshot, which is point three. Having such a difference is terribly confusing for the reader, and shows low tutorial quality content.