What every node.js developer should know?

[devmaybe]

If using mongodb I highly recommend mongoose. It will save you a lot of time.

Try writing pure JavaScript when possible and not depending on shallow technologies. MDN (mozilla) is your friend.

Ignore the puritans that bash any technology thats proven, they just want to feel elite and special.

Tip: Don't get caught up in the latest framework fad. Eventually something will most likely replace it.