Phlearn
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Photoshop and Lightroom tutorial site with free videos and a paid pro library covering retouching, masking, compositing and colour work. Lessons are task-based, leaving you able to reproduce a specific edit on your own images.
More resources on Photo Editing
Cambridge in Colour
Tutorial library explaining the concepts behind digital photography and post-processing: histograms, tonal curves, sharpening, noise, colour management and printing. Explanations are camera-agnostic, so you finish understanding why an edit works rather than which button to press.
Photoshop 2024 Essential Training
Master photo-editing in Photoshop 2024! Learn essential techniques from expert Julieanne Kost and unlock your creative potential.
Mastering Lightroom
Master photo-editing in Lightroom with Jared Platt's course! Learn to organize & enhance your photos like a pro.
KelbyOne
Subscription training site founded by Scott Kelby with classes on Photoshop, Lightroom and photographic technique, taught by working photographers. Courses run as structured video series, so you can follow a full retouching or workflow method end to end.
PiXimperfect
Unmesh Dinda's free Photoshop tutorial site, organised around selections, masking, compositing, retouching and colour grading. Each lesson works through a real image, so you learn the reasoning behind a technique alongside the steps.
Adobe Photoshop CC for Photographers
Martin Evening's reference manual covering Photoshop's photographic workflow: raw processing in Camera Raw, layers, masking, retouching, sharpening, and color management. Readers finish able to build a repeatable editing process for their own images.