I started using editing software since I was 14. It was Corel Photopaint and back then, the software wasn't nearly as complicated. It was trial and error, self-learning. Then I switched to Photoshop because it was what everyone else used. Now it's only of the essential tools for work. I cannot imagine trying to learn it now from scratch without being forced to rely on it.
The best way to learn it is to have a specific need. Say you want to adjust the contrast of a specific spot on your photo. Then go online to search for specific tools to do what you want. That way you will remember the tool better especially the next time you need it again.
If you just watch videos without understanding the need, you will forget it quickly.
I'd also suggest you to, perhaps start a thread on a photoshop project. Say you took a photo that you want to edit. Post it on the thread and ask specific questions on what you want to achieve. You will get specific responds, you apply it, and then move on to the next thing that you want to do with the photo, until it is finished. I don't know if other members will find it annoying, well, they can choose to ignore the thread then, but I will be glad to help.