First off... I am not an expert on cities, longtime resident of this place, nor a native New Yorker. I moved to New York in January 2016 so you can do the math of how long it's been since I left the golden shores of California. I'm guessing that you're most likely not an expert on New York City either since you're here.
When you live in NYC and you know a lot of people outside of it, it doesn't matter how long your stay has been — people ask for tips and recommendations. A lot. Honestly, I think I made this guide out of guilt of not being able to help all those friends I've ignored due to being busy.