Node Modules:
How do modules work in node?
If a variable is declared at the top level and exported, what is the scope?

Databases:
What is a relational DB?
What is a Document-based DB?
What are the differences in SQL vs NoSQL?
* Strengths and weaknesses of a relational DB?
* Strengths and weaknesses of a Document DB?

What are streams in node and how do they work?
What uses cases are good for streams?