List of Helpful Photography Training Content on YouTube

Photography Channels

• Tony & Chelsea Northrup
  Vast wealth of information on all aspects of photography from basic exposure tutorials, gear discussions, training, business, community interaction, photo critiques, etc.
• Photoshop Training Channel
  Very clear and easy to follow tutorials on advanced photo editing techniques
• Mango Street
  Tastefully trendy photography tutorials that cover everything from posing models and selecting locations to shooting and editing skills
• Riley Brandt
  Tutorials on processing photos with free & open source software including darktable and Gimp
• Sean Tucker
  Very high quality tutorials, examples, and discussion on shootoing, editing, creating in various genres
• Taylor Jackson
  Great mixture of breaking down high end, pro-level shooting and editing; awesome quick tips; and other longer form vlog chats about photography
• The Phlog Photography
• Phlearn 
  Excellent Photoshop editing lessons that can be applied to most open source applications
• PiXimperfect
  Very extensive and really easy to follow tutorials on advanced retouching and editing procedures
• Lucy Martin
  Fun, quality, easy to follow editing tutorials
• Peter Zelinka
  Incredibly clear astrophotography lessons, including gear selection, setup, and processing topics
• Tarjeen&Co
  Indie- and trendy channel with short, direct lessons on shooting, editing, gear, analyzing others' photos, etc. Great content
• The Phlog Photography
  Vast collection of landscape processing/editing sessions from raw image to finished photograph

• Fstoppers
  A wide variety of interesting tutorials, discussions, tips, and behind the scenes breakdowns of pro style work
• Matt Granger
• Peter McKinnon - Good info. The channel is super popular and it's getting a little too Vloggy more but there's still good info on shooting, editing, etc.
• The Slanted Lens
• Run N Gun
  Very short and to the point lessons with tips, tricks, and info on photography
• workphlo
  Commercial product photography methods that cover lighting, shooting, compositing, and editing. Although product photography isn't a particularly popular subject, these tutorials provide incredibly rapid and easy to follow illustrations of very advanced lighting, compositing, and editing techniques which are useful in all other forms of photography. It's really helpful even if you're not interested in product work, and the skills are delivered so clearly that it's easy to learn a lot that you can apply to your own skillset
• Mads Peter Iversen - Fantastic landscape photography instruction.
• Rich Baum
  Real estate photography essentials. Lots of really well explained examples of a technique called "flambiant" which is a composite of flash and ambient exposures.
• We Eat Together - Food photography discussion and tips
• TinHouse Studio - Food photography lighting, questions, etc.
• Jimmy McIntyre
  Advanced editing tutorials
• Shutterbug
• Evan Ranft
• Karl Taylor
• KelbyOne - A larger channel with lots of interviews, tutorioals, reviews, etc.
• Josh Katz
  More of a young, vlogger feel. Decent advice and info on gear and shooting

• And finally, here's an entire discussion with /r/photography's favorite channels, and another list of editing videos

Videography and Film Making Channels

• DSLRguide
• D4Darious
• Film Riot
• Indy Mogul
• DSLR Video Shooter

Playlists

• Beginning Photography Essentials by Tony & Chelsea Northrup
• My own collection of the most helpful videos I've seen on photography to bring you from absolute beginner to advanced lighting/shooting/editing proficiency; or to shore up gaps in your skill set with excellent tutorials. This is a work in progress, but any of these current videos should give you ideas and recommendations on where to look next for various topics on photography
• My collection of Astrophotography tutorials that range from polar-aligning a telescope to imaging and processing photographs