Upload & Sell: On
You already got lots of good advice from some really awesome people, so instead of repeating what they said, I'll just add that you need to give yourself time to grow. The learning process is very rewarding, but is also very long, and can be frustrating at times. Don't try to do everything at once; take your time, pick your priorities, and don't give up!
All the technical stuff that seems so hard now will soon become a no-brainer. Exposure, for example, was really hard to understand when I first started out (wtf are these F numbers? 2.8 is how many stops bigger than 5.6?!? It doesn't make sense!), but is second nature now. Lightroom was a maze of options impossible to master, but not anymore.
Why am I saying this? To highlight one of the most important pieces of advice you received, from Kent (RustyBug):
But ... imo, understanding elements of composition and the nature of light relative to the message / image are vastly far more important than the first three. Sure, there comes a time when the first three do make a difference as you are growing and advancing ... but without the last one, or your vision, voice, message ... the first three are kinda like painting over rust, its just dressing up a lack of substance.
I say these things, not to dissuade you ... but instead, to say "don't sweat the first three". Instead focus your attention on the last one, as well as your message/voice/vision/understanding. Sure, it is good to learn to shoot RAW, learn PP and buy better gear ... but the time & effort involved there will steal some of your time, effort and energy from learning the other stuff ... which, imo is WAY MORE IMPORTANT.
Just starting out ... skip the worry about the first three and focus on number four ... you'll know when it is time to start worrying about the first three (later).
Lastly, Bob did an awesome rework on your image. It might seem like it happened thanks to his PP (post-processing) skills; however, PP skills need to serve one's vision. Without vision, there's no amount of PP in the world that's going to make your image good. So, instead of looking at that rework as an example of why PP skills are important, look at it as an example of why vision/composition/message is important - he had to see that image in his mind's eye before he could modify your original image to achieve it.
Welcome to a long but fun journey!