I had just sent this to Phanjam on discord, and figured others would be interested.

This is a LONG series called "Humane Rigging"  it is all done in blender by the guy that wrote the "Rigify" plugin.  It teaches FK, IK, how to build switches between the two.  Starts with the basics and then builds upon it.  By far the best rigging and animation tutorial I have seen.

I recommend watching each video all the way through, then replaying it and trying to follow along before going on to the next video.
The later videos get pretty advanced.

Bonus:  Fun Spanish guitar music when the presenter isn't talking.

[youtube]https://youtu.be/fzCuCCMWuog[/youtube]

Bonus:  Fun Spanish guitar music when the presenter isn't talking.

= = = I suddenly want to one day make a "Fun Spanish Guitar TL2 Boss Music and Sound FX Mod" many years into the future which will give me plenty of years to learn in the mean time!

On a more serious note: Thanks @Vkoslak as this is very helpful to all of us who are interested in custom meshes, rigging, animations and imports.