Once you get the basics down, there are lots of Youtube channels that show you how to do specific edits. So you can watch someone create a bunch of layers and adjustments and create something amazing and then start cussing because you can't duplicate it. Do some searches for whatever you shoot like "landscape photoshop" or "retouching photoshop" and when you find something you like you might subscribe to the channel and watch their other videos. I have a list of Youtube people that I keep up with all their new videos. You can also see demonstrations of specific functions you don't understand and where books or Adobe might not be as helpful as you want. Like you could search for "healing brush" or "liquify tool" and get several videos of people using the functions. Personally i find videos more helpful than the books because you can watch them go through the process and see the changes as they move along. Sometimes it's not as easy to see when figure 5 is on one page and figure 6 is a page or two later.