I know Note durations, time signatures, scales, how to build chords. Basically everything here http://www.musictheory.net/lessons
So I was wondering what I should learn next and if anyone knows a good website to learn it from.

I tend to like music with several different parts at once.
IE: Iron Maiden (3 guitars)
Nine inch Nails (Synths+sometimes has 3 guitars)
Celldweller (Guitar+Synths, bass-lines are often different from the guitar parts)
how about putting everything you know into practice? websites can only do so much.

all the information on the best websites in the world is no substitute for information put into practice.
Anfangen ist leicht, Beharren eine Kunst.
I do apply what I've learned (I didn't just learn shapes), and while I do need more practice applying those things (I'll always need more practice) I'm just wondering what else there is to learn out there. Surely there's more to music theory than just chords and scales?
The majority of theory is knowing how to use chords and scales. And applying what you know of chords and scales is the only reliable way to learn how to use them :P
What do you guys listen to when playing video games?
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Men fapping.

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I'll be leaving your closet now.
The next book on my reading list is: How Music Works, by John Powell. As I understand it, its the physics of sound/music:

·What is the difference between a musical note and any other sort of sound?

·What is harmony, and why does it sound good?

·Why is it easy to tell the difference between a flute and a clarinet even if they are playing exactly the same note?

·Why do ten violins sound only twice as loud as one?

·What is perfect pitch, and do I have it?

Discover the answers to these and many other questions in John Powell's charming, straight-talking and ear-opening guide to what music is and how exactly it works. Written by a composer with a PhD in physics, How Music Works is a unique and entertaining guide. Opening up the world of acoustics and the science of music to deepen our appreciation and understanding of what we listen to, How Music Works covers subjects from the difference between how we hear a musical note and any other kind of sound, to a brief history of the scale system, why a run of arpeggios sounds 'romantic' and why a flute sounds different to a clarinet. The perfect book for players and listeners alike.

Theres a short promo on YouTube.