Welcome to Steem. Good intro. There's a lot on Steem. Right now it is the pretty much the deepest social platform in terms of functionalities and tools with even many more apps being built on it.

Here is one tool you might find useful right away"
https://steemd.com/@gritata
This tells you everything going on related to you account. Check my blog out it's mostly about tech but follow if you like reading stuff like that as well.