Welcome! I have some good info on the top valued topics and best time of day to post.

https://steemit.com/steemit/@brianjuice/choosing-the-most-valuable-category-for-your-steemit-posts

https://steemit.com/steemit/@brianjuice/what-s-the-best-time-to-post-for-the-most-value-2017626t92724846z

As for overall Steem information, use the search feature and you'll find a lot of information. You can search "new to steemit"