just start with something really simple, like a low-poly arm similar to the Ancient Pig tutorial that Eric Chadwick posted above. Once you see how the elbow bends you should be able to understand how to make the topology so that it works correctly.
It sounds like the question is more of the why, than the how of topology, which is a little trickier. Understanding where to put your edges loops to get a good poly flow takes some research and practice. Ancient Pigs tutorial, taken from the Polycount wiki, should give you a clearer of how it should all work. From there,…
Even with good video tutorials you still run into having to sit through most of it to find info. They aren't easily searchable like a text document is. Maybe someone will create a system that transcribes text and makes the videos searchable but that doesn't exists... that I know of. It's easier to make a bad video tutorial…