functions can certainly be tricky! This guide has some really well laid out tutorials on the subject and has a lot of really good examples. You might not need it if you're already doing course work or something, but it can make for a useful bookmark.

The Modern JavaScript Tutorial

Modern JavaScript Tutorial: simple, but detailed explanations with examples and tasks, including: closures, document and events, object oriented programming and more.

My favorite JS vids are now all outdated. Though I'll link a playlist, I think the most important one is Section 8: Programming Style & Your Brain, which gets into why consistency is such an important thing to learn when writing code.

Crockford on JavaScript - Section 8: Programming Style & Your Brain

YouTube video by YUI Library