Documentation and Demo mismatch

[lambdalisue]

There were many parts in the documentation that lacked information such as 'which file to write in' or a complete implementation of each section, so I was reading it while referring to the demo simultaneously. However, upon reaching the chapter on application implementation, I noticed that many parts differed between the documentation and the demo, which has caused me to stop progressing. The current documentation seems outdated—would it be better to just learn from the demo alone?