Ever wonder what the Exposure Triangle is? Well here's your answer:
Video by Some Stuff Explained
Video by Wolfcrow
Here is a great series of videos from Adorama everything you could possible want to know about the Exposure Triangle is covered.
Exposure Triangle in Practice.
Videos by Adorama.
Here is another great video on the Exposure Triangle from SLR Lounge:
Video by SLR Lounge
Video explaining the "three basics" of photography:
Video by Matthew Gore