Styleguide
The key word here is consistency. By having a pattern to follow, we can maintain our code clean, improve team communication, and also make things easier for newcomers.
Airbnb has put together a great set of rules and best-practices for Javascript, which we can easily use in our code with eslint.
https://github.com/airbnb/javascript
There is also a few guidelines for CSS/SASS:
http://cssguidelin.es/
http://codeguide.co/
We also have an open repo (WIP) for Startaê’s style guides: