It does seem like you're overlooking a lot of the tools we have on this site that are geared towards helping authors who are beginning.
There's the writer's workshop that's linked on the front page and referenced multiple times in our quality standards and other places which authors who are starting out should be checking anyways before they post a story.
We also have the writer's lounge where experienced writers talk about their craft, what helps them, where they can give advice that they found helpful to their audience.
Finally, there's the writing advice sections that are all geared towards giving people advice in multiple fields/styles that cover a wide range of topics.
I'd like to close by mentioning a majority of the stories we delete from first time writers are ones that haven't used the writer's workshop and fall into a lot of pitfalls pointed out in the links above and tend to make the same basic grammar mistakes (failure to punctuate sentences properly, capitalization issues with proper nouns, sentences and dialogue, and have proof-reading issues like awkward wording and plot holes). Authors who have used those tools generally don't have their stories deleted as they tend to avoid the issues I mentioned above and spend more time proof-reading and revising their stories.