FLEB is a YouTube channel dedicated to teaching people about puzzles.
It's a mixture of amazing puzzles, techniques for solving, and videos about puzzle design.
Here's a video about how to better understand the Rubik's Cube and how to generate your own solutions:
Here's a video about an amazing puzzle designed by Todd Etter, only available at an invite-only puzzle competition:
Here's a video about how to solve burr puzzles, and the techniques you might encounter:
Here's a video critiquing the brainteaser design of the latest Professor Layton game:
I hope you enjoy the videos. Many more are available on the YouTube channel.