Hey! Welcome :) check this out if you haven't already:

• FAQ is great. Whitepaper also does a decent job explaining how things work under the hood.
• steemd.com is an indispensible tool.
• If you want notifications on mobile, install eSteem.

Other than that, nothing comes from the top of my mind.

If you have particular questions, just google them. Steemians are good at explaining stuff, and google is good at finding their articles. I constantly google things like "what is that of steemit" and "how to do something on steemit". More often than not, the answer is right there at the top row.