I have been teaching Photoshop since 1998 and Lightroom since 2007 to imaging professionals and aspiring amateurs alike. The first 20 years was me in a class room or lecture hall teaching the material over and over again. Now it's all on video so you can watch it as many times as you like.
I've started out with my Lightroom content, but I have plenty of Photoshop and Colour Management material to come!