I never used it before, was thinking about it the other day actually... What's Amazon's attitude towards these kind of services? I see a lot of publishers farming reviews.
I am a beginner in kdp i have 50 dollars budget for the month to the ads is that will be enough or i cant start with that and its good to pick a niche with 10000 results and have high demand or not and thank you for your informations ❤
$50 is more than enough to start, check out my video where I show a "secret" ad strategy, it should get you going under $1/day and it's super simple to setup. I still use it today, it's by far the most effective strategy I've tried. As far as the niche is concerned, I wouldn't worry about the number of results as long as it's got demand (books achieve low BSR). Ask yourself if you can create a better or unique product to what you see on the first page. Also, analyse the books on the front page and see how recently they have been published, if they're fairly recent (last few months) there is space for your new book too as long as it's good. That's how I determine whether it's worth publishing in the niche or not. Hope this helps, good luck!
Get publishing! Focus on creating good quality books in a niche with good search volume and low competition. Don't get discouraged, your first book might not succeed, just keep going and improve with each book. Check out my other vids for tips on keyword research/ad strategies to get started. Good luck!