Checked amazon this morning, had a sale from it. I was very shocked. I wrote 2 articles for it and no backlinks at all. Same thing happened with a few other sites that I never had any sales with before.
So in the last few days I made 9 sales from 3 sites that I forgot that I had, and had decided to come back later every time I remembered them.
If you're struggling in this, don't fret. Just keep going! Stop taking in too much information just Practice and make sites. You can't get good if you don't practice at anything, SEO is the same way!
So stop reading and go make a new site!
Best of wishes,