Congratulations and welcome aboard. I have been a member for over 5 years but did almost nothing as this was before all the new help sections were added. Also there was this G2G feature that was for genealogists. So, since I didn't realize I was now considered a genealogist it took me until July 2017 to realize it was a forum.
So, now that I have realized this fact, bear in mind 2 more. You WILL make mistakes. It happens and you learn from them. Also, Ask Ask Ask if you need help. You may not always be satisfied with the answer but it is always better than not knowing at all.
Most of all, have fun. Tags you follow in your profile affect what you see in G2G. I'd recommend announcements for sure.