Here are some other good resources:
https://steemit.com/steemit/@donkeypong/announcement-steemit-101-e-book-released-for-free-part-1

Hive account@shenanigator is working on an official Steemit FAQ
https://steemit.com/steemit/@shenanigator/official-steemit-faq-rough-draft-your-edits-are-needed
https://steemit.com/steemit/@shenanigator/official-steemit-faq-2nd-draft-your-input-is-appreciated
https://steemit.com/steemit/@shenanigator/steemit-faq-a-few-remaining-questions-for-technical-pros-and-steemit-dev-team

Hive account@timcliff wrote a good posting asking the community for beginner tips
https://steemit.com/fun/@timcliff/what-is-your-best-tip-for-newcomers-to-be-successful-on-steemit-the-daily-steem-poll-question-for-the-community

@Steemitguide has put together some great infographics! They've done a great job of succinctly answering a lot of questions that we all have about the Steemit platform.
As an example, here is the the post that they made for introducing Steemit to newcomers: https://steemit.com/steem/@steemitguide/steemit-101-who-need-s-a-decentralized-social-network-and-what-makes-steemit-so-special

For the advanced area:
Hive account@timcliff is doing a great job in collecting all of the suggestions from the community
https://steemit.com/steemit-ideas/@timcliff/the-steemit-wish-list-avatars-notifications-multi-language-support-and-more-oh-my-v2-0