Is there tutorials to walk through the operations of document creation?
Start with documentation provided on the official site.
As a surrogate, the built-in help is not that bad, but it is very concise and you must guess the purpose from the uses.
To show the community your question has been answered, click the ✓ next to the correct answer, and “upvote” by clicking on the ^ arrow of any helpful answers. These are the mechanisms for communicating the quality of the Q&A on this site. Thanks!