Some things I think you should look into.
- Testing your code thoroughly with framework like for example mocha
is very important.
- learn npm
to publish your own modules and to search
for other modules.
- A database like for example mysql, mongodb or redis
and how to use them in node.js
. I pesonally really like redis client library
for it's insane speed.
to put your code into a repository(SCM).
Solution courtesy of: Alfred