I want to learn about rigging stuff

Well I guess first and foremost there's the first stoop which is the Fundamentals of rigging:

https://cgcookie.com/courses/core-fundamentals-of-rigging-blender

Then there's Off Road, a course focusing on that:

https://cgcookie.com/courses/off-road-rig-and-animate-an-rc-monster-truck-in-blender

Then there's a couple of old courses that have a ton of golden and timeless knowledge, all you have to do is get over the UI changes:

https://cgcookie.com/courses/rigging-vehicles-with-automatic-suspension

https://cgcookie.com/courses/mechanical-rigging-of-a-fighter-jet-in-blender

https://cgcookie.com/courses/rigging-tank-treads

https://cgcookie.com/courses/rigging-train-wheels-in-blender

And then there's courses that make cool rigging on the periphery:

https://cgcookie.com/courses/spider-animate-in-blender-easy

https://cgcookie.com/courses/collab-03-livestreams