Where to market/sell ebooks?

How do you sell on Amazon quickly?

Is there a way to get an ebook on there and keyword optimized in a day or so?

I'm interested in it but it looked a bit complicated.

I agree with Ryan's comment. The only thing is that I would argue that there is definitely competition in the eBook world. Although I understand Ryan's point about the creative plane, most of us literally judge a book by it's cover. With so many e-book titles available, people are going to decide on their e-book purchases based on e-book covers, user ratings, the quality of the reading samples, and so many other factors. This is where the competition comes into play. You have to constantly find ways to set your content apart from the competition.

That being said, I am not sure that there is a way to "sell on Amazon quickly" without using blackhat tactics i.e. manipulation an algorithm to rank higher, or using automation etc. The only way to do what you are asking such as manipulating a service to rank your eBook higher on display is by (1) experience: if you publish enough content to a platform you will eventually (through prowess or dumb luck) find a way to manipulate ranking algorithms), (2) spending money: you can pay people to teach you, or hire them to use their own "tricks" to manipulate rankings in your favor, or (3) networking with people: if you make friends with the right people, you might actually get lucky and find someone who is willing to share their methods/profits with you.

None of those tactics are actually easy, and they may not even actually work to help you make "quick money" so I would suggest that you follow Ryan's advice, and understand that it is going to take a lot of work to make money in any niche in this industry. So to answer your initial question. It is actually difficult to be successful in any niche if you do not have much experience. You are going to have to learn, overcome almost guaranteed failure, and the continue to persevere. Success usually ends much quicker than it comes in this industry, so even if you do somehow become successful overnight, you should never lay all your eggs in one basket.