Level Pixel Level writes:
This a video tutorial outlining how to rig a simple IK arm in Blender 2.8. This is part of a longer series called Rigging For Animation. This ongoing series starts from the very basics of rigging and works up to rigging full assets for animators.
Here are the latest videos, Part 1 - an introduction to IK:
Part 2 - This is a cleanup pass reviewing how to prepare a final asset:
You can find all of the assets used here for free on the Level Pixel Level Gumroad account.
If you want more tips for how to rig for animators here is a link to the series playlist.