I created a course called Enhancing Photos for Complete Beginners at Udemy. It uses mainly Photoshop Elements (along with a touch of Affinity Photo and Pixelmator) to go through the very basics of image editing. It's here and is completely free. It covers the 5 steps I think every beginner should consider taking when developing a photo, and then goes a little further & talks about things like layer masks etc. You can read what the reviews are like here and if I can just lift the comments from the last two reviewers:
'This course is an excellent introduction to photo editing, and I would highly recommend it to anyone with limited or no experience working with photo editing software. This course is well structured, and the instruction provided couldn’t be better.'
'Simon is an amazing teacher. The way he explains everything is very clear and practical. I usually use Photoshop to retouch my pics but I've learned some basis principles in this course I didn't understand before. No matter if you are a novice or you have some photography knowledge, this course is worth. 5/5'
Did I mention that it's free? I hope it's of use to you.