Initial Sound Resources
Videos
It is HIGHLY recommended to listen to all videos with headphones or in a car. Otherwise, you are likely to miss a lot of the dynamics that are being demonstrated in most of these videos.
The Basics
These are much watch videos to get the basic understanding of what the typical board functions do, and to get the basics of the terminology down. Just choose to ignore the intro audio on the Tech Tuesday videos.
Tech Tuesday
These are nice as he gives examples of each element and what it does.
Mic level vs Line level vs Instrument level (why we need gain)
The Production Academy
These are much, much quicker videos than above, and are more of an overview but with more of an explanation of all the components, and goes over the whole signal chain.
What does a mixing console do in live music? (Mixer Fundamentals #1)
The Preamp Section (Mixer Fundamentals)
EQ, Pan, Mute, and Faders (Mixer Fundamentals)
Where do we put our Compressors and Gates? (Mixer Fundamentals #4)
What are Aux Sends (Mixer Fundamentals #5)?
Our Mix has to leave the console somehow... (Mixer Fundamentals #6)
We have a Mix. Now what? (Live Sound Mixer Fundamentals #7)
Other Sources:
These are different sites with other videos that help explain the basics:
Aux and Groups explained in less than 11 minutes
Struggling with Feedback? Easy Solution!
Alternative Wrapping cables (and why)