It isn't about Photoshop so much as it is to recommend
formal instruction.
Where you actually have a human being to instruct you while you incrementally learn the program, though difficult as it may be. Where when you ask for help each time there is actually someone there to help you to learn.
Something most online and dry tutorials aren't apt to do. The reality in most cases is that you won't find adult education programs teaching any other bitmap graphics programs other than Photoshop. The first bitmap graphics program I learned on my own with some degree of proficiency was Corel Photo Paint which came bundled with Corel Draw 3, a vector graphics program.
I can recommend other freeware products like GNU Image Manipulation (GIMP) and it does have tutorials, though you're completely on your own. Or Paint.net as well. They aren't simple, though neither are they Adobe Photoshop. At least with freeware the only real investment becomes the amount of time to either learn it or give up on it.
GIMP - GNU Image Manipulation Program
https://www.getpaint.net/