Here are a few of my favorite photography teachers and links to their websites and YouTube videos:

Steve Arnold: Adobe Lightroom and Photoshop - https://postprocessingmastery.com/

Matt Kloskowski: Adobe Lightroom and Photoshop - https://www.youtube.com/c/MattKloskowski

B&H Photography YouTube Channel: Great collection of videos to learn about photography - https://www.youtube.com/c/BandH/videos

PHLEARN: Great YouTube channel for learning Adobe Photoshop - https://www.youtube.com/c/phlearn