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#291
As for the learning curve, it depends on what you do. If all you want is to surf the web and use email, any LTS Linux such as mint will do nicely. Elementary OS has practically no learning curve at all (except it comes without an office suite, which you need to install, which is easy to do. also, the browser and email are not that great; once again though you can upgrade to Firefox and Thunderbird easily. With most linux systems you get all this out of the box).
As for needing windows for specific tasks, because software makers make them preferentially for windows, this is why you dual boot. You use windows for the photo-editing you do, but linux for everything else. Personally, I am continuing with W7 Pro for my music creation, keeping it offline by default. I use Linux for everything else, especially for anything security-sensitive. Currently, I am using Zorin Lite and LXLE, both light systems (my graphics card on my old Gateway desktop broke, so I'm back to on-board graphics - 10 years old - and need a very light system for them to work).
As for the command line (called the terminal in Linux), all you need to do is a search on whatever you are doing. And follow the steps. I usually just copy paste the commands due to my terrible typing. You do need to get it exact, or it won't work. I keep a list handy of the commands I use most. Eventually you get the hang of it. The terminal is extremely powerful, and very fast. It's a great way to install apps. For example, in many distros, all you do is "sudo apt-get update" then "sudo apt-get install firefox". As long as the commands are grammatically correct, the system will do all the work for you. "Sudo" refers to doing something as root, akin to administrator.
As for there being many distros, yes it's in the hundreds, but this is actually fun. It's easy to become addicted to "distro-hopping." That is, trying out new Linux systems. This also gives you the opportunity to learn as different distros do things differently in some case. Of course, if you just want an easy to use system that will be supported for the next 5 years, there are many to choose from. And you can try them out in most cases without installing them, which makes it quick, safe and easy to get a sense on which ones you might like.